def _computeMO(self, i):
cube = CubeData()
atomlist = self.tddftb.dftb2.getGeometry()
(xmin, xmax), (ymin, ymax), (zmin, zmax) = Cube.get_bbox(atomlist,
dbuff=5.0)
dx, dy, dz = xmax - xmin, ymax - ymin, zmax - zmin
ppb_text = self.ppbGrid.itemText(self.ppbGrid.currentIndex())
ppb = float(ppb_text.split()[1]) # points per bohr
nx, ny, nz = int(dx * ppb), int(dy * ppb), int(dz * ppb)
x, y, z = np.mgrid[xmin:xmax:nx * 1j, ymin:ymax:ny * 1j,
zmin:zmax:nz * 1j]
grid = (x, y, z)
#
orbs = self.tddftb.dftb2.getKSCoefficients()
moGrid = Cube.orbital_amplitude(grid,
self.bs.bfs,
orbs[:, i],
cache=True)
mo_cube = CubeData()
mo_cube.data = moGrid.real
mo_cube.grid = grid
mo_cube.atomlist = atomlist
return mo_cube
def test_dipole_prepared_continuum():
"""
see
G. Fronzoni, M. Stener, S. Furlan, P. Decleva
Chemical Physics 273 (2001) 117-133
"""
from DFTB.LR_TDDFTB import LR_TDDFTB
from DFTB import XYZ
from DFTB.Scattering import slako_tables_scattering
# BOUND ORBITAL = H**O
atomlist = XYZ.read_xyz("./water.xyz")[0]
tddftb = LR_TDDFTB(atomlist)
tddftb.setGeometry(atomlist, charge=0)
options = {"nstates": 1}
tddftb.getEnergies(**options)
valorbs, radial_val = load_pseudo_atoms(atomlist)
H**O, LUMO = tddftb.dftb2.getFrontierOrbitals()
bound_orbs = tddftb.dftb2.getKSCoefficients()
# polarization direction of E-field
epol = np.array([0.0, 1.0, 0.0])
# according to Koopman's theorem the electron is ionized from the H**O
mo_indx = range(0, len(bound_orbs))
nmo = len(mo_indx)
for imo in range(0, nmo):
mo_bound = bound_orbs[:, mo_indx[imo]]
# CONTINUUM ORBITALS at energy E
for E in slako_tables_scattering.energies:
bs = AtomicScatteringBasisSet(atomlist, E)
SKT_bf, SKT_ff = load_slako_scattering(atomlist, E)
Dipole = ScatteringDipoleMatrix(atomlist, valorbs, SKT_bf)
# projection of dipoles onto polarization direction
Dipole_projected = np.zeros((Dipole.shape[0], Dipole.shape[1]))
for xyz in [0, 1, 2]:
Dipole_projected += Dipole[:, :, xyz] * epol[xyz]
# unnormalized coefficients of dipole-prepared continuum orbitals
mo_scatt = np.dot(mo_bound, Dipole_projected)
nrm2 = np.dot(mo_scatt, mo_scatt)
# normalized coefficients
mo_scatt /= np.sqrt(nrm2)
Cube.orbital2grid(atomlist, bs.bfs, mo_scatt, \
filename="/tmp/scattering_orbital_%d_to_%s.cube" % (imo, str(E).replace(".", "p")), dbuff=25.0)
delattr(Cube.orbital_amplitude, "cached_grid")
def wavefunction(grid, dV):
# evaluate orbital
amp = Cube.orbital_amplitude(grid,
bs.bfs,
scat_orbs[:, i],
cache=False)
return amp
def _computeTransitionAndDifferenceDensity(self, I):
Ptrans = self.tddftb.TransitionDensityMatrix(I)
P0, PI = self.tddftb.ExcitedDensityMatrix(I)
Pdif = PI - P0
cube = CubeData()
atomlist = self.tddftb.dftb2.getGeometry()
(xmin, xmax), (ymin, ymax), (zmin, zmax) = Cube.get_bbox(atomlist,
dbuff=5.0)
dx, dy, dz = xmax - xmin, ymax - ymin, zmax - zmin
ppb_text = self.ppbGrid.itemText(self.ppbGrid.currentIndex())
ppb = float(ppb_text.split()[1]) # points per bohr
#print "points per bohr: %s" % ppb
nx, ny, nz = int(dx * ppb), int(dy * ppb), int(dz * ppb)
x, y, z = np.mgrid[xmin:xmax:nx * 1j, ymin:ymax:ny * 1j,
zmin:zmax:nz * 1j]
grid = (x, y, z)
# transition density
tdenseGrid = Cube.electron_density(grid, self.bs.bfs, Ptrans)
tdense_cube = CubeData()
tdense_cube.data = tdenseGrid
tdense_cube.grid = grid
tdense_cube.atomlist = atomlist
## approximate difference density based on particle and hole charges
#dqI = self.partial_charges[I]
#difdenseGrid = self.bs_aux.partial_density(dqI, 0.0*self.tddftb.dftb2.ddip, x,y,z)
# exact difference density
difdenseGrid = Cube.electron_density(grid, self.bs.bfs, Pdif)
difdense_cube = CubeData()
difdense_cube.data = difdenseGrid
difdense_cube.grid = grid
difdense_cube.atomlist = atomlist
return tdense_cube, difdense_cube
def plotBoundOrbital(self):
selected = self.orbitalSelection.selectedItems()
assert len(selected) == 1
selected_orbital = self.orbital_dict[str(selected[0].text())]
self.mo_bound = self.bound_orbs[:, selected_orbital]
# shift geometry so that the expectation value of the dipole operator vanishes
# dipole matrix
dipole = np.tensordot(self.mo_bound,
np.tensordot(self.tddftb.dftb2.D,
self.mo_bound,
axes=(1, 0)),
axes=(0, 0))
print "expectation value of dipole: %s" % dipole
# shift molecule R -> R - dipole
self.atomlist = MolCo.transform_molecule(
self.tddftb.dftb2.getGeometry(), (0, 0, 0), -dipole)
# load bound basis functions
self.bs_bound = AtomicBasisSet(self.atomlist)
# plot selected orbital
(xmin, xmax), (ymin, ymax), (zmin, zmax) = Cube.get_bbox(self.atomlist,
dbuff=5.0)
dx, dy, dz = xmax - xmin, ymax - ymin, zmax - zmin
ppb = 3.0 # Points per bohr
nx, ny, nz = int(dx * ppb), int(dy * ppb), int(dz * ppb)
x, y, z = np.mgrid[xmin:xmax:nx * 1j, ymin:ymax:ny * 1j,
zmin:zmax:nz * 1j]
grid = (x, y, z)
amplitude_bound = Cube.orbital_amplitude(grid,
self.bs_bound.bfs,
self.mo_bound,
cache=False)
bound_cube = CubeData()
bound_cube.data = amplitude_bound.real
bound_cube.grid = grid
bound_cube.atomlist = self.atomlist
self.boundOrbitalViewer.setCubes([bound_cube])
def loadContinuum(self):
E = self.photo_kinetic_energy
k = np.sqrt(2 * E)
wavelength = 2.0 * np.pi / k
# determine the radius of the sphere where the angular distribution is calculated. It should be
# much larger than the extent of the molecule
(xmin, xmax), (ymin, ymax), (zmin, zmax) = Cube.get_bbox(self.atomlist,
dbuff=0.0)
dx, dy, dz = xmax - xmin, ymax - ymin, zmax - zmin
Rmax0 = self.settings.getOption("Averaging", "sphere radius Rmax")
Rmax = max([dx, dy, dz]) + Rmax0
Npts = max(int(Rmax), 1) * 50
print "Radius of sphere around molecule, Rmax = %s bohr" % Rmax
print "Points on radial grid, Npts = %d" % Npts
self.bs_free = AtomicScatteringBasisSet(self.atomlist,
E,
rmin=0.0,
rmax=Rmax + 2 * wavelength,
Npts=Npts)
self.SKT_bf, SKT_ff = load_slako_scattering(self.atomlist, E)
if self.settings.getOption("Continuum Orbital",
"Ionization transitions") == "inter-atomic":
inter_atomic = True
else:
inter_atomic = False
print "inter-atomic transitions: %s" % inter_atomic
self.Dipole = ScatteringDipoleMatrix(self.atomlist,
self.valorbs,
self.SKT_bf,
inter_atomic=inter_atomic).real
#
if self.activate_average.isChecked():
print "ORIENTATION AVERAGING"
npts_euler = self.settings.getOption("Averaging",
"Euler angle grid points")
npts_theta = self.settings.getOption("Averaging",
"polar angle grid points")
self.orientation_averaging = PAD.OrientationAveraging_small_memory(
self.Dipole,
self.bs_free,
Rmax,
E,
npts_euler=npts_euler,
npts_theta=npts_theta)
else:
print "NO AVERAGING"
(opts, args) = parser.parse_args()
if len(args) < 6:
print usage
exit(-1)
# input cube files
Mx_cube_file = args[0]
My_cube_file = args[1]
Mz_cube_file = args[2]
# output cube files
Ax_cube_file = args[3]
Ay_cube_file = args[4]
Az_cube_file = args[5]
# load cube files with magnetic dipole density
print "load magnetic dipole density from cube files..."
atomlist, origin, axes, Mx = Cube.readCube(Mx_cube_file)
atomlist, origin, axes, My = Cube.readCube(My_cube_file)
atomlist, origin, axes, Mz = Cube.readCube(Mz_cube_file)
print "compute vector potential..."
Ax,Ay,Az = vector_potential_Poisson(atomlist, origin, axes, Mx, My, Mz,
poisson_solver=opts.solver,
conv_eps=opts.conv_eps, maxiter=opts.maxiter)
# save vector potential
Cube.writeCube(Ax_cube_file, atomlist, origin, axes, Ax)
Cube.writeCube(Ay_cube_file, atomlist, origin, axes, Ay)
Cube.writeCube(Az_cube_file, atomlist, origin, axes, Az)
print "x-,y- and z-components of vector potential saved to '%s', '%s' and '%s'" % (Ax_cube_file, Ay_cube_file, Az_cube_file)
def f(x, y, z):
# evaluate orbital
grid = (x, y, z)
amp = Cube.orbital_amplitude(grid, bs.bfs, mo, cache=False)
return amp
def test_scattering_orbitals():
from DFTB.LR_TDDFTB import LR_TDDFTB
from DFTB import XYZ
atomlist = XYZ.read_xyz("h2.xyz")[0]
tddftb = LR_TDDFTB(atomlist)
tddftb.setGeometry(atomlist, charge=0)
options = {"nstates": 1}
tddftb.getEnergies(**options)
valorbs, radial_val = load_pseudo_atoms(atomlist)
E = 5.0 / 27.211
bs = AtomicScatteringBasisSet(atomlist, E)
print bs.bfs
SKT_bf, SKT_ff = load_slako_scattering(atomlist, E)
S_bb, H0_bb = tddftb.dftb2._constructH0andS()
S_bf, H0_bf = ScatteringHamiltonianMatrix(atomlist, valorbs, SKT_bf)
#
invS_bb = la.inv(S_bb)
# (H-E*S)^t . Id . (H-E*S)
HmE2 = np.dot(H0_bf.conjugate().transpose(), np.dot(invS_bb, H0_bf)) \
- E * np.dot( S_bf.conjugate().transpose(), np.dot(invS_bb, H0_bf)) \
- E * np.dot(H0_bf.conjugate().transpose(), np.dot(invS_bb, S_bf)) \
+ E**2 * np.dot(S_bf.conjugate().transpose(), np.dot(invS_bb, S_bf))
Scont = continuum_flux(atomlist, SKT_bf)
S2 = np.dot(S_bf.conjugate().transpose(), np.dot(la.inv(S_bb), S_bf))
"""
#
H2 = np.dot(H0_bf.transpose(), np.dot(la.inv(S_bb), H0_bf))
S2 = np.dot( S_bf.transpose(), np.dot(la.inv(S_bb), S_bf))
print "H2"
print H2
print "S2"
print S2
scat_orbe2, scat_orbs = sla.eig(H2) #, S2)
print "PKE = %s" % E
print "Energies^2 = %s" % scat_orbe2
scat_orbe = np.sqrt(scat_orbe2)
sort_indx = np.argsort(scat_orbe)
scat_orbe = scat_orbe[sort_indx]
scat_orbs = scat_orbs[:,sort_indx]
print "Energies of scattering orbitals: %s" % scat_orbe
orbE = np.argmin(abs(scat_orbe-E))
"""
assert np.sum(abs(HmE2.conjugate().transpose() - HmE2)) < 1.0e-10
assert np.sum(abs(S2.conjugate().transpose() - S2)) < 1.0e-10
lambdas, scat_orbs = sla.eigh(HmE2)
print "lambdas = %s" % lambdas
from DFTB.Scattering import PAD
for i in range(0, len(lambdas)):
if abs(lambdas[i]) > 1.0e-8:
print "%d lambda = %s" % (i, lambdas[i])
###
def wavefunction(grid, dV):
# evaluate orbital
amp = Cube.orbital_amplitude(grid,
bs.bfs,
scat_orbs[:, i],
cache=False)
return amp
PAD.asymptotic_density(wavefunction, 20, E)
###
for (flm, l, m) in classify_lm(bs, scat_orbs[:, i]):
if abs(flm).max() > 1.0e-4:
print " %s %s %s" % (l, m, abs(flm))
Cube.orbital2grid(atomlist, bs.bfs, scat_orbs[:,i], \
filename="/tmp/scattering_orbital_%d.cube" % i, dbuff=25.0)
delattr(Cube.orbital_amplitude, "cached_grid")
def atomic_ion_averaged_pad_scan(energy_range,
data_file,
npts_r=60,
rmax=300.0,
lebedev_order=23,
radial_grid_factor=3,
units="eV-Mb",
tdip_threshold=1.0e-5):
"""
compute the photoelectron angular distribution for an ensemble of istropically
oriented atomic ions.
Parameters
----------
energy_range : numpy array with photoelectron kinetic energies (PKE)
for which the PAD should be calculated
data_file : path to file, a table with PKE, SIGMA and BETA is written
Optional
--------
npts_r : number of radial grid points for integration on interval [rmax,rmax+2pi/k]
rmax : large radius at which the continuum orbitals can be matched
with the asymptotic solution
lebedev_order : order of Lebedev grid for angular integrals
radial_grid_factor
: factor by which the number of grid points is increased
for integration on the interval [0,+inf]
units : units for energies and photoionization cross section in output, 'eV-Mb' (eV and Megabarn) or 'a.u.'
tdip_threshold : continuum orbitals |f> are neglected if their transition dipole moments mu = |<i|r|f>| to the
initial orbital |i> are below this threshold.
"""
print ""
print "*******************************************"
print "* PHOTOELECTRON ANGULAR DISTRIBUTIONS *"
print "*******************************************"
print ""
Z = 1
atomlist = [(Z, (0.0, 0.0, 0.0))]
# determine the radius of the sphere where the angular distribution is calculated. It should be
# much larger than the extent of the molecule
(xmin, xmax), (ymin, ymax), (zmin, zmax) = Cube.get_bbox(atomlist,
dbuff=0.0)
dx, dy, dz = xmax - xmin, ymax - ymin, zmax - zmin
# increase rmax by the size of the molecule
rmax += max([dx, dy, dz])
Npts = max(int(rmax), 1) * 50
print "Radius of sphere around molecule, rmax = %s bohr" % rmax
print "Points on radial grid, Npts = %d" % Npts
# load bound pseudoatoms
basis = AtomicBasisSet(atomlist, confined=False)
bound_orbital = basis.bfs[0]
# compute PADs for all energies
pad_data = []
print " SCAN"
print " Writing table with PAD to %s" % data_file
# table headers
header = ""
header += "# npts_r: %s rmax: %s" % (npts_r, rmax) + '\n'
header += "# lebedev_order: %s radial_grid_factor: %s" % (
lebedev_order, radial_grid_factor) + '\n'
if units == "eV-Mb":
header += "# PKE/eV SIGMA/Mb BETA2" + '\n'
else:
header += "# PKE/Eh SIGMA/bohr^2 BETA2" + '\n'
# save table
access_mode = MPI.MODE_WRONLY | MPI.MODE_CREATE
fh = MPI.File.Open(comm, data_file, access_mode)
if rank == 0:
# only process 0 write the header
fh.Write_ordered(header)
else:
fh.Write_ordered('')
for i, energy in enumerate(energy_range):
if i % size == rank:
print " PKE = %6.6f Hartree (%4.4f eV)" % (
energy, energy * AtomicData.hartree_to_eV)
# continuum orbitals at a given energy
continuum_orbitals = []
# quantum numbers of continuum orbitals (n,l,m)
quantum_numbers = []
phase_shifts = []
print "compute atomic continuum orbitals ..."
valorbs, radial_val, phase_shifts_val = load_pseudo_atoms_scattering(
atomlist, energy, rmin=0.0, rmax=2 * rmax, Npts=100000, lmax=3)
pos = np.array([0.0, 0.0, 0.0])
for indx, (n, l, m) in enumerate(valorbs[Z]):
continuum_orbital = AtomicBasisFunction(
Z, pos, n, l, m, radial_val[Z][indx], 0)
continuum_orbitals.append(continuum_orbital)
quantum_numbers.append((n, l, m))
phase_shifts.append(phase_shifts_val[Z][indx])
# transition dipoles between bound and free orbitals
dipoles = transition_dipole_integrals(
atomlist, [bound_orbital],
continuum_orbitals,
radial_grid_factor=radial_grid_factor,
lebedev_order=lebedev_order)
# Continuum orbitals with vanishing transition dipole moments to the initial orbital
# do not contribute to the PAD. Filter out those continuum orbitals |f> for which
# mu^2 = |<i|r|f>|^2 < threshold
mu = np.sqrt(np.sum(dipoles[0, :, :]**2, axis=-1))
dipoles_important = dipoles[0, mu > tdip_threshold, :]
continuum_orbitals_important = [
continuum_orbitals[i]
for i in range(0, len(continuum_orbitals))
if mu[i] > tdip_threshold
]
quantum_numbers_important = [
quantum_numbers[i] for i in range(0, len(continuum_orbitals))
if mu[i] > tdip_threshold
]
phase_shifts_important = [[
phase_shifts[i]
] for i in range(0, len(continuum_orbitals))
if mu[i] > tdip_threshold]
print " %d of %d continuum orbitals have non-vanishing transition dipoles " \
% (len(continuum_orbitals_important), len(continuum_orbitals))
print " to initial orbital (|<i|r|f>| > %e)" % tdip_threshold
print " Quantum Numbers"
print " ==============="
row_labels = [
"orb. %2.1d" % a
for a in range(0, len(quantum_numbers_important))
]
col_labels = ["N", "L", "M"]
txt = annotated_matrix(np.array(quantum_numbers_important),
row_labels,
col_labels,
format="%s")
print txt
print " Phase Shifts (in units of pi)"
print " ============================="
row_labels = [
"orb. %2.1d" % a for a in range(0, len(phase_shifts_important))
]
col_labels = ["Delta"]
txt = annotated_matrix(np.array(phase_shifts_important) / np.pi,
row_labels,
col_labels,
format=" %8.6f ")
print txt
print " Transition Dipoles"
print " =================="
print " threshold = %e" % tdip_threshold
row_labels = [
"orb. %2.1d" % a
for a in range(0, len(quantum_numbers_important))
]
col_labels = ["X", "Y", "Z"]
txt = annotated_matrix(dipoles_important, row_labels, col_labels)
print txt
#
Cs, LMs = asymptotic_Ylm(continuum_orbitals_important,
energy,
rmax=rmax,
npts_r=npts_r,
lebedev_order=lebedev_order)
# expand product of continuum orbitals into spherical harmonics of order L=0,2
Amo, LMs = angular_product_distribution(
continuum_orbitals_important,
energy,
rmax=rmax,
npts_r=npts_r,
lebedev_order=lebedev_order)
# compute PAD for ionization from orbital 0 (the bound orbital)
sigma, beta = photoangular_distribution(dipoles_important, Amo,
LMs, energy)
if units == "eV-Mb":
energy *= AtomicData.hartree_to_eV
# convert cross section sigma from bohr^2 to Mb
sigma *= AtomicData.bohr2_to_megabarn
pad_data.append([energy, sigma, beta])
# save row with PAD for this energy to table
row = "%10.6f %10.6e %+10.6e" % tuple(pad_data[-1]) + '\n'
fh.Write_ordered(row)
fh.Close()
print " Photoelectron Angular Distribution"
print " =================================="
print " units: %s" % units
row_labels = [" " for en in energy_range]
col_labels = ["energy", "sigma", "beta2"]
txt = annotated_matrix(np.array(pad_data).real, row_labels, col_labels)
print txt
print "FINISHED"
def averaged_pad_scan(xyz_file, dyson_file,
selected_orbitals, npts_euler, npts_theta, nskip, inter_atomic, sphere_radius):
molecule_name = os.path.basename(xyz_file).replace(".xyz", "")
atomlist = XYZ.read_xyz(xyz_file)[-1]
# shift molecule to center of mass
print "shift molecule to center of mass"
pos = XYZ.atomlist2vector(atomlist)
masses = AtomicData.atomlist2masses(atomlist)
pos_com = MolCo.shift_to_com(pos, masses)
atomlist = XYZ.vector2atomlist(pos_com, atomlist)
# compute molecular orbitals with DFTB
tddftb = LR_TDDFTB(atomlist)
tddftb.setGeometry(atomlist, charge=0)
options={"nstates": 1}
try:
tddftb.getEnergies(**options)
except DFTB.Solver.ExcitedStatesNotConverged:
pass
valorbs, radial_val = load_pseudo_atoms(atomlist)
if dyson_file == None:
print "tight-binding Kohn-Sham orbitals are taken as Dyson orbitals"
H**O, LUMO = tddftb.dftb2.getFrontierOrbitals()
bound_orbs = tddftb.dftb2.getKSCoefficients()
if selected_orbitals == None:
# all orbitals
selected_orbitals = range(0,bound_orbs.shape[1])
else:
selected_orbitals = eval(selected_orbitals, {}, {"H**O": H**O+1, "LUMO": LUMO+1})
print "Indeces of selected orbitals (counting from 1): %s" % selected_orbitals
orbital_names = ["orb_%s" % o for o in selected_orbitals]
selected_orbitals = np.array(selected_orbitals, dtype=int)-1 # counting from 0
dyson_orbs = bound_orbs[:,selected_orbitals]
ionization_energies = -tddftb.dftb2.getKSEnergies()[selected_orbitals]
else:
print "coeffients for Dyson orbitals are read from '%s'" % dyson_file
orbital_names, ionization_energies, dyson_orbs = load_dyson_orbitals(dyson_file)
ionization_energies = np.array(ionization_energies) / AtomicData.hartree_to_eV
print ""
print "*******************************************"
print "* PHOTOELECTRON ANGULAR DISTRIBUTIONS *"
print "*******************************************"
print ""
# determine the radius of the sphere where the angular distribution is calculated. It should be
# much larger than the extent of the molecule
(xmin,xmax),(ymin,ymax),(zmin,zmax) = Cube.get_bbox(atomlist, dbuff=0.0)
dx,dy,dz = xmax-xmin,ymax-ymin,zmax-zmin
Rmax = max([dx,dy,dz]) + sphere_radius
Npts = max(int(Rmax),1) * 50
print "Radius of sphere around molecule, Rmax = %s bohr" % Rmax
print "Points on radial grid, Npts = %d" % Npts
nr_dyson_orbs = len(orbital_names)
# compute PADs for all selected orbitals
for iorb in range(0, nr_dyson_orbs):
print "computing photoangular distribution for orbital %s" % orbital_names[iorb]
data_file = "betas_" + molecule_name + "_" + orbital_names[iorb] + ".dat"
pad_data = []
print " SCAN"
nskip = max(1, nskip)
# save table
fh = open(data_file, "w")
print " Writing table with betas to %s" % data_file
print>>fh, "# ionization from orbital %s IE = %6.3f eV" % (orbital_names[iorb], ionization_energies[iorb]*AtomicData.hartree_to_eV)
print>>fh, "# inter_atomic: %s npts_euler: %s npts_theta: %s rmax: %s" % (inter_atomic, npts_euler, npts_theta, Rmax)
print>>fh, "# PKE/eV sigma beta1 beta2 beta3 beta4"
for i,E in enumerate(slako_tables_scattering.energies):
if i % nskip != 0:
continue
print " PKE = %6.6f Hartree (%4.4f eV)" % (E, E*AtomicData.hartree_to_eV)
k = np.sqrt(2*E)
wavelength = 2.0 * np.pi/k
bs_free = AtomicScatteringBasisSet(atomlist, E, rmin=0.0, rmax=Rmax+2*wavelength, Npts=Npts)
SKT_bf, SKT_ff = load_slako_scattering(atomlist, E)
Dipole = ScatteringDipoleMatrix(atomlist, valorbs, SKT_bf, inter_atomic=inter_atomic).real
orientation_averaging = PAD.OrientationAveraging_small_memory(Dipole, bs_free, Rmax, E, npts_euler=npts_euler, npts_theta=npts_theta)
pad,betasE = orientation_averaging.averaged_pad(dyson_orbs[:,iorb])
pad_data.append( [E*AtomicData.hartree_to_eV] + list(betasE) )
# save PAD for this energy
print>>fh, "%10.6f %10.6e %+10.6e %+10.6f %+10.6e %+10.6e" % tuple(pad_data[-1])
fh.flush()
fh.close()
def wavefunction(grid, dV):
# evaluate continuum orbital
amp = Cube.orbital_amplitude(grid, bs.bfs, mo_scatt, cache=False)
return amp
m,n,q = 0,0,0
trig = 'cos'
energy,(Rfunc1,Sfunc1,Pfunc1),wavefunction1 = wfn.getBoundOrbital(m,n,trig,q)
print "Energy: %s Hartree" % energy
"""
# compute the continuum orbital with PKE=5 eV
m, n, E = 0, 1, 5.0 / 27.211
trig = 'cos'
Delta, (Rfunc2, Sfunc2,
Pfunc2), wavefunction2 = wfn.getContinuumOrbital(m, n, trig, E)
print "Phase shift: %s" % Delta
Cube.function_to_cubefile(
atomlist,
wavefunction2,
filename="/tmp/h2+_continuum_orbital_%d_%d_%s.cube" %
(m, n, str(E).replace(".", "p")),
dbuff=15.0,
ppb=2.5)
from DFTB.Scattering import PAD
PAD.asymptotic_density(wavefunction2, 20.0, E)
plt.show()
# build LCAO of two atomic s-waves with PKE=5 eV
from DFTB.Scattering.SlakoScattering import AtomicScatteringBasisSet
bs = AtomicScatteringBasisSet(atomlist, E)
lcao_continuum = np.array([
+1.0,
0.0,
default="charges",
help=
"The charges can be saved to the file either as a single column ('charges') or together with the atomic positions in the xyz-format ('xyz')"
)
(opts, args) = parser.parse_args()
if len(args) < 2:
print(usage)
exit(-1)
esp_cube_file = args[0]
chg_file = args[1]
# load cube file with electrostatic potential (esp)
print("load ESP from cube file...")
atomlist, origin, axes, data = Cube.readCube(esp_cube_file)
if opts.fit_centers != "":
print("loading fit centers from '%s'" % opts.fit_centers)
atomlist = XYZ.read_xyz(opts.fit_centers)[0]
# extract positions of points and values of ESP
points, epot = Cube.get_points_and_values(origin, axes, data)
# fit point charges
chelpg = CHELPG()
chelpg.setFitPoints(points, epot)
chelpg.setAtomicCenters(atomlist, charge=0)
partial_charges = chelpg.fitESP()
# save point charges
if opts.format == 'charges':
np.savetxt(chg_file, partial_charges)
dest="nuclear_potential",
type=int,
help=
"Should the nuclear potential be added to the electrostatic potential (0: no, 1: yes) [default: %default]",
default=1)
(opts, args) = parser.parse_args()
if len(args) < 2:
print usage
exit(-1)
rho_cube_file = args[0]
pot_cube_file = args[1]
# load cube file with electronic density
print "load density from cube file..."
atomlist, origin, axes, rho = Cube.readCube(rho_cube_file)
print "compute electrostatic potential..."
pot = electrostatic_potential_Poisson(
atomlist,
origin,
axes,
rho,
poisson_solver=opts.solver,
conv_eps=opts.conv_eps,
maxiter=opts.maxiter,
nuclear_potential=opts.nuclear_potential)
# save potential
Cube.writeCube(pot_cube_file, atomlist, origin, axes, pot)
print "electrostatic potential saved to '%s'" % pot_cube_file
def plotMFPAD(self):
Rmax = 80.0
npts = 30
E = self.photo_kinetic_energy
k = np.sqrt(2 * E)
wavelength = 2.0 * np.pi / k
# spherical grid
rs, thetas, phis = np.mgrid[Rmax:(Rmax + wavelength):30j,
0.0:np.pi:npts * 1j,
0.0:2 * np.pi:npts * 1j]
# transformed into cartesian coordinates
xs = rs * np.sin(thetas) * np.cos(phis)
ys = rs * np.sin(thetas) * np.sin(phis)
zs = rs * np.cos(thetas)
grid = (xs, ys, zs)
amplitude_continuum = Cube.orbital_amplitude(grid,
self.bs_free.bfs,
self.mo_free,
cache=False)
# integrate continuum orbital along radial-direction for 1 wavelength
wfn2 = abs(amplitude_continuum)**2
#
dr = wavelength / 30.0
wfn2_angular = np.sum(wfn2 * dr, axis=0)
# SPHERICAL PLOT
self.MFPADfig3D.clf()
xs = wfn2_angular * np.sin(thetas[0, :, :]) * np.cos(phis[0, :, :])
ys = wfn2_angular * np.sin(thetas[0, :, :]) * np.sin(phis[0, :, :])
zs = wfn2_angular * np.cos(thetas[0, :, :])
ax = self.MFPADfig3D.add_subplot(111, projection='3d')
rmax = wfn2_angular.max() * 1.5
ax.set_xlim((-rmax, rmax))
ax.set_ylim((-rmax, rmax))
ax.set_zlim((-rmax, rmax))
ax.set_xlabel("x")
ax.set_ylabel("y")
ax.set_zlabel("z")
# draw efield
arrow_vec = wfn2_angular.max() * 1.2 * self.epol / la.norm(self.epol)
arrow = Arrow3D([0.0, arrow_vec[0]], [0.0, arrow_vec[1]],
[0.0, arrow_vec[2]],
color=(0.0, 1.0, 0.0),
mutation_scale=20,
lw=2,
arrowstyle="-|>")
ax.add_artist(arrow)
ax.text(arrow_vec[0],
arrow_vec[1],
arrow_vec[2],
"E-field",
color=(0.0, 1.0, 0.0))
ax.plot_surface(xs, ys, zs, rstride=1, cstride=1)
ax.scatter(xs, ys, zs, color="k", s=20)
ax.get_xaxis().set_ticks([])
ax.get_yaxis().set_ticks([])
ax.w_zaxis.set_ticks([])
self.MFPADCanvas3D.draw()
# 2D PLOT
self.MFPADfig2D.clf()
ax = self.MFPADfig2D.add_subplot(111)
image = ax.imshow(np.fliplr(wfn2_angular.transpose()),
extent=[0.0, np.pi, 0.0, 2 * np.pi],
aspect=0.5,
origin='lower')
ax.set_xlim((0.0, np.pi))
ax.set_ylim((0.0, 2 * np.pi))
ax.set_xlabel("$\\theta$")
ax.set_ylabel("$\phi$")
self.MFPADfig2D.colorbar(image)
# show piercing points of E-field vector
# ... coming out of the plane
r = la.norm(self.epol)
th_efield = np.arccos(self.epol[2] / r)
phi_efield = np.arctan2(self.epol[1], self.epol[0]) + np.pi
print "th, phi = %s %s" % (th_efield, phi_efield)
ax.plot([th_efield], [phi_efield],
"o",
markersize=10,
color=(0.0, 1.0, 0.0))
ax.text(th_efield,
phi_efield,
"E-field",
color=(0.0, 1.0, 0.0),
ha="center",
va="top")
# ... going into the plane
th_efield = np.arccos(-self.epol[2] / r)
phi_efield = np.arctan2(-self.epol[1], -self.epol[0]) + np.pi
print "- th, phi = %s %s" % (th_efield, phi_efield)
ax.plot([th_efield], [phi_efield],
"x",
markersize=10,
color=(0.0, 1.0, 0.0))
self.MFPADCanvas2D.draw()
def plotContinuumOrbital(self):
dbuff = self.settings["Cube"]["extra space / bohr"]
ppb = self.settings["Cube"]["points per bohr"]
(xmin, xmax), (ymin, ymax), (zmin, zmax) = Cube.get_bbox(self.atomlist,
dbuff=dbuff)
dx, dy, dz = xmax - xmin, ymax - ymin, zmax - zmin
nx, ny, nz = int(dx * ppb), int(dy * ppb), int(dz * ppb)
x, y, z = np.mgrid[xmin:xmax:nx * 1j, ymin:ymax:ny * 1j,
zmin:zmax:nz * 1j]
grid = (x, y, z)
# plot continuum orbital
# projection of dipoles onto polarization direction
Dipole_projected = np.zeros(
(self.Dipole.shape[0], self.Dipole.shape[1]))
# normalize polarization
epol_unit = self.epol / np.sqrt(np.dot(self.epol, self.epol))
print "Polarization direction of E-field:"
print "E (normalized) = %s" % epol_unit
for xyz in [0, 1, 2]:
Dipole_projected += self.Dipole[:, :, xyz] * epol_unit[xyz]
#print "Dipole projected"
#print Dipole_projected
# unnormalized coefficients of dipole-prepared continuum orbitals
self.mo_free = np.dot(self.mo_bound, Dipole_projected)
nrm2 = np.dot(self.mo_free.conjugate(), self.mo_free)
#print "nrm2 = %s" % nrm2
# normalized coefficients
self.mo_free /= np.sqrt(nrm2)
amplitude_continuum = Cube.orbital_amplitude(grid,
self.bs_free.bfs,
self.mo_free,
cache=False)
continuum_cube = CubeData()
continuum_cube.data = amplitude_continuum.real
continuum_cube.grid = grid
continuum_cube.atomlist = self.atomlist
self.continuumOrbitalViewer.setCubes([continuum_cube])
# plot E-field
for o in self.efield_objects:
o.remove()
mlab = self.continuumOrbitalViewer.visualization.scene.mlab
# self.efield_arrow = mlab.quiver3d(0,0,0, self.epol[0], self.epol[1], self.epol[2],
self.efield_arrow = mlab.quiver3d(0,
0,
0,
float(self.epol[0]),
float(self.epol[1]),
float(self.epol[2]),
color=(0.0, 1.0, 0.0),
scale_factor=1.0,
mode='arrow',
resolution=20,
figure=self.continuumOrbitalViewer.
visualization.scene.mayavi_scene)
self.efield_text = mlab.text(self.epol[0],
self.epol[1],
"E-field",
z=self.epol[2],
figure=self.continuumOrbitalViewer.
visualization.scene.mayavi_scene)
self.efield_text.actor.set(text_scale_mode='none',
width=0.05,
height=0.1)
self.efield_text.property.set(justification='centered',
vertical_justification='centered')
self.efield_head = mlab.points3d([self.epol[0]], [self.epol[1]],
[self.epol[2]],
scale_factor=0.5,
mode='cube',
resolution=20,
color=(0.0, 1.0, 0.0),
figure=self.continuumOrbitalViewer.
visualization.scene.mayavi_scene)
self.efield_head.glyph.glyph_source.glyph_source.center = [0, 0, 0]
self.efield_outline = mlab.outline(line_width=3,
figure=self.continuumOrbitalViewer.
visualization.scene.mayavi_scene)
self.efield_outline.outline_mode = 'cornered'
w = 0.1
self.efield_outline.bounds = (self.epol[0] - w, self.epol[0] + w,
self.epol[1] - w, self.epol[1] + w,
self.epol[2] - w, self.epol[2] + w)
self.efield_objects = [
self.efield_arrow, self.efield_text, self.efield_head,
self.efield_outline
]
self.efield_actors = [self.efield_head.actor.actors]
def h2_ion_averaged_pad_scan(energy_range,
data_file,
npts_r=60,
rmax=300.0,
lebedev_order=23,
radial_grid_factor=3,
units="eV-Mb",
tdip_threshold=1.0e-5):
"""
compute the photoelectron angular distribution for an ensemble of istropically
oriented H2+ ions.
Parameters
----------
energy_range : numpy array with photoelectron kinetic energies (PKE)
for which the PAD should be calculated
data_file : path to file, a table with PKE, SIGMA and BETA is written
Optional
--------
npts_r : number of radial grid points for integration on interval [rmax,rmax+2pi/k]
rmax : large radius at which the continuum orbitals can be matched
with the asymptotic solution
lebedev_order : order of Lebedev grid for angular integrals
radial_grid_factor
: factor by which the number of grid points is increased
for integration on the interval [0,+inf]
units : units for energies and photoionization cross section in output, 'eV-Mb' (eV and Megabarn) or 'a.u.'
tdip_threshold : continuum orbitals |f> are neglected if their transition dipole moments mu = |<i|r|f>| to the
initial orbital |i> are below this threshold.
"""
print ""
print "*******************************************"
print "* PHOTOELECTRON ANGULAR DISTRIBUTIONS *"
print "*******************************************"
print ""
# bond length in bohr
R = 2.0
# two protons
Za = 1.0
Zb = 1.0
atomlist = [(1, (0, 0, -R / 2.0)), (1, (0, 0, +R / 2.0))]
# determine the radius of the sphere where the angular distribution is calculated. It should be
# much larger than the extent of the molecule
(xmin, xmax), (ymin, ymax), (zmin, zmax) = Cube.get_bbox(atomlist,
dbuff=0.0)
dx, dy, dz = xmax - xmin, ymax - ymin, zmax - zmin
# increase rmax by the size of the molecule
rmax += max([dx, dy, dz])
Npts = max(int(rmax), 1) * 50
print "Radius of sphere around molecule, rmax = %s bohr" % rmax
print "Points on radial grid, Npts = %d" % Npts
# load separation constants or tabulate them if the file 'separation_constants.dat'
# does not exist
Lsep = SeparationConstants(R, Za, Zb)
try:
Lsep.load_separation_constants()
except IOError as err:
nmax = 10
mmax = 3
print "generating separation constants..."
nc2 = 200
energy_range = np.linspace(-35.0, 20.0, nc2) * 2.0 / R**2
Lsep.tabulate_separation_constants(energy_range, nmax=nmax, mmax=mmax)
Lsep.load_separation_constants()
### DEBUG
#Lsep.mmax = 1
#Lsep.nmax = 1
###
#
wfn = DimerWavefunctions(R, Za, Zb)
# compute the bound orbitals without any radial nor angular nodes,
# the 1sigma_g orbital
m, n, q = 0, 0, 0
trig = 'cos'
energy, (Rfunc1, Sfunc1,
Pfunc1), wavefunction1 = wfn.getBoundOrbital(m, n, trig, q)
print "Energy: %s Hartree" % energy
bound_orbital = WrapperWavefunction(wavefunction1)
### DEBUG
# save cube file for initial bound orbital
Cube.function_to_cubefile(atomlist,
wavefunction1,
filename="/tmp/h2+_bound_orbital_%d_%d_%d.cube" %
(m, n, q),
dbuff=10.0)
###
# compute PADs for all energies
pad_data = []
print " SCAN"
print " Writing table with PAD to %s" % data_file
# table headers
header = ""
header += "# npts_r: %s rmax: %s" % (npts_r, rmax) + '\n'
header += "# lebedev_order: %s radial_grid_factor: %s" % (
lebedev_order, radial_grid_factor) + '\n'
if units == "eV-Mb":
header += "# PKE/eV SIGMA/Mb BETA2" + '\n'
else:
header += "# PKE/Eh SIGMA/bohr^2 BETA2" + '\n'
# save table
access_mode = MPI.MODE_WRONLY | MPI.MODE_CREATE
fh = MPI.File.Open(comm, data_file, access_mode)
if rank == 0:
# only process 0 write the header
fh.Write_ordered(header)
else:
fh.Write_ordered('')
for i, energy in enumerate(energy_range):
if i % size == rank:
print " PKE = %6.6f Hartree (%4.4f eV)" % (
energy, energy * AtomicData.hartree_to_eV)
# continuum orbitals at a given energy
continuum_orbitals = []
# quantum numbers of continuum orbitals (m,n,trig)
quantum_numbers = []
phase_shifts = []
# transition dipoles
nc = 2 * (Lsep.mmax + 1) * (
Lsep.nmax +
1) - 1 # number of continuum orbitals at each energy
dipoles_RSP = np.zeros((1, nc, 3))
#
print "Continuum orbital m n P phase shift (in \pi rad)"
print " # nodes in P cos(m*pi) or sin(m*pi) "
print "-------------------------------------------------------------------------------------------------------"
ic = 0 # enumerate continuum orbitals
for m in range(0, Lsep.mmax + 1):
if m > 0:
# for m > 0, there are two solutions for P(phi): sin(m*phi) and cos(m*phi)
Psolutions = ['cos', 'sin']
else:
Psolutions = ['cos']
for trig in Psolutions:
for n in range(0, Lsep.nmax + 1):
Delta, (
Rfunc2, Sfunc2,
Pfunc2), wavefunction2 = wfn.getContinuumOrbital(
m, n, trig, energy)
#print "energy= %s eV m= %d n= %d phase shift= %s \pi rad" % (energy*AtomicData.hartree_to_eV, m,n,Delta / np.pi)
print " %3.1d %2.1d %2.1d %s %8.6f" % (
ic, m, n, trig, Delta)
continuum_orbital = WrapperWavefunction(wavefunction2)
continuum_orbitals.append(continuum_orbital)
quantum_numbers.append((m, n, trig))
phase_shifts.append(Delta)
### DEBUG
# save cube file for continuum orbital
Cube.function_to_cubefile(
atomlist,
wavefunction2,
filename="/tmp/h2+_continuum_orbital_%d_%d_%s.cube"
% (m, n, trig),
dbuff=10.0)
###
# compute transition dipoles exploiting the factorization
# of the wavefunction as R(xi)*S(eta)*P(phi). These integrals
# are probably more accurate then those using Becke's integration scheme
dipoles_RSP[0, ic, :] = wfn.transition_dipoles(
Rfunc1, Sfunc1, Pfunc1, Rfunc2, Sfunc2, Pfunc2)
ic += 1
print ""
# transition dipoles between bound and free orbitals
dipoles = transition_dipole_integrals(
atomlist, [bound_orbital],
continuum_orbitals,
radial_grid_factor=radial_grid_factor,
lebedev_order=lebedev_order)
# Continuum orbitals with vanishing transition dipole moments to the initial orbital
# do not contribute to the PAD. Filter out those continuum orbitals |f> for which
# mu^2 = |<i|r|f>|^2 < threshold
mu = np.sqrt(np.sum(dipoles[0, :, :]**2, axis=-1))
dipoles_important = dipoles[0, mu > tdip_threshold, :]
continuum_orbitals_important = [
continuum_orbitals[i]
for i in range(0, len(continuum_orbitals))
if mu[i] > tdip_threshold
]
quantum_numbers_important = [
quantum_numbers[i] for i in range(0, len(continuum_orbitals))
if mu[i] > tdip_threshold
]
phase_shifts_important = [[
phase_shifts[i]
] for i in range(0, len(continuum_orbitals))
if mu[i] > tdip_threshold]
print " %d of %d continuum orbitals have non-vanishing transition dipoles " \
% (len(continuum_orbitals_important), len(continuum_orbitals))
print " to initial orbital (|<i|r|f>| > %e)" % tdip_threshold
print " H2+ Quantum Numbers"
print " ==================="
row_labels = [
"orb. %2.1d" % a
for a in range(0, len(quantum_numbers_important))
]
col_labels = ["M", "N", "Trig"]
txt = annotated_matrix(np.array(quantum_numbers_important),
row_labels,
col_labels,
format="%s")
print txt
print " Phase Shifts (in units of pi)"
print " ============================="
row_labels = [
"orb. %2.1d" % a for a in range(0, len(phase_shifts_important))
]
col_labels = ["Delta"]
txt = annotated_matrix(np.array(phase_shifts_important) / np.pi,
row_labels,
col_labels,
format=" %8.6f ")
print txt
print " Transition Dipoles"
print " =================="
print " threshold = %e" % tdip_threshold
row_labels = [
"orb. %2.1d" % a
for a in range(0, len(quantum_numbers_important))
]
col_labels = ["X", "Y", "Z"]
txt = annotated_matrix(dipoles_important, row_labels, col_labels)
print txt
# compare transition dipoles from two integration methods
print "check transition dipoles between bound and continuum orbitals"
ic = 0 # enumerate continuum orbitals
for m in range(0, Lsep.mmax + 1):
if m > 0:
# for m > 0, there are two solutions for P(phi): sin(m*phi) and cos(m*phi)
Psolutions = ['cos', 'sin']
else:
Psolutions = ['cos']
for trig in Psolutions:
for n in range(0, Lsep.nmax + 1):
print "continuum orbital %d (m= %d n= %d trig= %s)" % (
ic, m, n, trig)
print " from factorization R*S*P : %s" % dipoles_RSP[
0, ic, :]
print " Becke's integration : %s" % dipoles[
0, ic, :]
ic += 1
print ""
#
Cs, LMs = asymptotic_Ylm(continuum_orbitals_important,
energy,
rmax=rmax,
npts_r=npts_r,
lebedev_order=lebedev_order)
# expand product of continuum orbitals into spherical harmonics of order L=0,2
Amo, LMs = angular_product_distribution(
continuum_orbitals_important,
energy,
rmax=rmax,
npts_r=npts_r,
lebedev_order=lebedev_order)
# compute PAD for ionization from orbital 0 (the bound orbital)
sigma, beta = photoangular_distribution(dipoles_important, Amo,
LMs, energy)
if units == "eV-Mb":
energy *= AtomicData.hartree_to_eV
# convert cross section sigma from bohr^2 to Mb
sigma *= AtomicData.bohr2_to_megabarn
pad_data.append([energy, sigma, beta])
# save row with PAD for this energy to table
row = "%10.6f %10.6e %+10.6e" % tuple(pad_data[-1]) + '\n'
fh.Write_ordered(row)
fh.Close()
print " Photoelectron Angular Distribution"
print " =================================="
print " units: %s" % units
row_labels = [" " for en in energy_range]
col_labels = ["energy", "sigma", "beta2"]
txt = annotated_matrix(np.array(pad_data).real, row_labels, col_labels)
print txt
print "FINISHED"
# input cube files
# ... for magnetic dipole density
Mx_cube_file = args[0]
My_cube_file = args[1]
Mz_cube_file = args[2]
# ... vector potential
Ax_cube_file = args[3]
Ay_cube_file = args[4]
Az_cube_file = args[5]
# output file
dat_file = args[6]
# load cube files components of magnetic dipole density
print "load magnetic dipole densities from cube files..."
atomlist, origin, axes, Mx = Cube.readCube(Mx_cube_file)
atomlist, origin, axes, My = Cube.readCube(My_cube_file)
atomlist, origin, axes, Mz = Cube.readCube(Mz_cube_file)
dx = la.norm(axes[0])
dy = la.norm(axes[1])
dz = la.norm(axes[2])
# volume element, assuming the axes are orthogonal
dV = dx * dy * dz
# find total magnetic dipole moment
mtot = np.array([np.sum(Mx * dV), np.sum(My * dV), np.sum(Mz * dV)])
# load cube files for components of vector potential
print "load magnetic vector potential from cube files..."
atomlist, origin, axes, Ax_data = Cube.readCube(Ax_cube_file)
atomlist, origin, axes, Ay_data = Cube.readCube(Ay_cube_file)
def test():
R = 2.0
Za = 1.0
Zb = 1.0
"""
nc2 = 200
energy_range = np.linspace(-35.0, 20.0, nc2) * 2.0/R**2
Lsep = SeparationConstants(R, Za, Zb)
Lsep.tabulate_separation_constants(energy_range, nmax=10, mmax=3)
Lsep.load_separation_constants()
discrete_spectrum = DiscreteSpectrum(Lsep)
#discrete_spectrum.tabulate_discrete_energies()
#discrete_spectrum.load_discrete_energies()
discrete_spectrum.binding_curve()
#Lfunc = Lsep.L_interpolated(0,0)
#xbound_eigenenergies(R, Za, Zb, energy_range, Lfunc)
"""
wfn = DimerWavefunctions(R, Za, Zb)
atomlist = [(1, (0, 0, -R / 2.0)), (1, (0, 0, +R / 2.0))]
m, n, q = 0, 0, 0
trig = 'cos'
energy, (Rfunc1, Sfunc1,
Pfunc1), wavefunction1 = wfn.getBoundOrbital(m, n, trig, q)
Cube.function_to_cubefile(
atomlist,
wavefunction1,
filename="/tmp/h2+_bound_orbital_%d_%d_%s_%d.cube" % (m, n, trig, q))
"""
m,n = 0,1
trig = 'cos'
Es = np.linspace(0.01, 15.0, 2)
phase_shifts = []
transition_dipoles = []
for E in Es:
Delta, (Rfunc2,Sfunc2,Pfunc2),wavefunction2 = wfn.getContinuumOrbital(m,n,trig,E)
phase_shifts.append(Delta)
tdip = wfn.transition_dipoles(Rfunc1,Sfunc1,Pfunc1, Rfunc2,Sfunc2,Pfunc2)
transition_dipoles.append(tdip)
plt.cla()
plt.xlabel("Energy / Hartree")
plt.ylabel("Phase Shift")
plt.plot(Es, phase_shifts)
plt.cla()
transition_dipoles = np.array(transition_dipoles)
xyz2label = ["X", "Y", "Z"]
for xyz in range(0, 3):
plt.plot(Es, transition_dipoles[:,xyz], label="%s" % xyz2label[xyz])
plt.legend()
plt.ioff()
plt.savefig("transition_dipoles.png")
plt.show()
"""
m, n, E = 0, 1, 1.0 / 27.211
trig = 'cos'
Delta, (Rfunc2, Sfunc2,
Pfunc2), wavefunction2 = wfn.getContinuumOrbital(m, n, trig, E)
Cube.function_to_cubefile(
atomlist,
wavefunction2,
filename="/tmp/h2+_continuum_orbital_%d_%d_%s.cube" %
(m, n, str(E).replace(".", "p")),
dbuff=15.0)
plt.ioff()
plt.show()
def test_lcao_continuum():
import matplotlib.pyplot as plt
# bond length in bohr
dist = 2.0
# positions of protons
posH1 = (0.0, 0.0, -dist / 2.0)
posH2 = (0.0, 0.0, +dist / 2.0)
atomlist = [(1, posH1), (1, posH2)]
# Set resolution of multicenter grid
settings.radial_grid_factor = 20
settings.lebedev_order = 23
# energy of continuum orbital
E = 1.0
# same functional as used in the calculation of pseudo orbitals
xc = XCFunctionals.libXCFunctional(Parameters.pseudo_orbital_x,
Parameters.pseudo_orbital_c)
dft = BasissetFreeDFT(atomlist, xc)
print("initial orbital guess from DFTB calculation")
orbitals = dft.getOrbitalGuess()
norb = len(orbitals)
# all orbitals are doubly occupied
nelec = 2 * norb
bound_orbitals = dft.getOrbitalGuess()
# effective potential
rho = density_func(bound_orbitals)
veff = effective_potential_func(atomlist, rho, xc, nelec=nelec)
ps = AtomicPotentialSet(atomlist)
r = np.linspace(-15.0, 15.0, 10000)
x = 0.0 * r
y = 0.0 * r
z = r
for lmax in [0, 1, 2, 3]:
bs = AtomicScatteringBasisSet(atomlist, E, lmax=lmax)
#test_AO_basis(atomlist, bs, ps, E)
R = residual2_matrix(atomlist, veff, ps, bs)
S = continuum_overlap(bs.bfs, E)
print("continuum overlap")
print(S)
print("residual^2 matrix")
print(R)
eigvals, eigvecs = sla.eigh(R, S)
print(eigvals)
print("eigenvector belonging to lowest eigenvalue")
print(eigvecs[:, 0])
# LCAO continuum orbitals
continuum_orbitals = orbital_transformation(atomlist, bs.bfs, eigvecs)
# improve continuum orbital by adding a correction term
#
# phi = phi0 + dphi
#
# The orbital correction dphi is the solution of the inhomogeneous
# Schroedinger equation
#
# (H-E)dphi = -(H-E)phi0
#
print("orbital correction...")
phi0 = continuum_orbitals[0]
phi = improve_continuum_orbital(atomlist, phi0, veff, E)
exit(-1)
residual_0 = residual_func(atomlist, phi0, veff, E)
def source(x, y, z):
return -residual_0(x, y, z)
delta_phi = inhomogeneous_schroedinger(atomlist, veff, source, E)
residual_d = residual_func(atomlist, delta_phi, veff, E)
a, b = variational_mixture_continuum(atomlist, phi0, delta_phi, veff,
E)
phi = add_two_functions(atomlist, phi0, delta_phi, a, b)
residual = residual_func(atomlist, phi, veff, E)
plt.plot(r, 1.0 / np.sqrt(2.0) * bs.bfs[0](x, y, z), label=r"AO")
plt.plot(r, phi0(x, y, z), label=r"$\phi_0$")
plt.plot(r, delta_phi(x, y, z), label=r"$\Delta \phi$")
plt.plot(r, phi(x, y, z), label=r"$\phi_0 + \Delta \phi$")
plt.legend()
plt.show()
"""
dphi = delta_phi(x,y,z)
imin = np.argmin(abs(r-1.0))
dphi[abs(r) < 1.0] = dphi[imin] - (dphi[abs(r) < 1.0] - dphi[imin])
plt.plot(r, dphi, label=r"$\Delta \phi$")
"""
plt.plot(r, residual_0(x, y, z), label=r"$(H-E) \phi_0$")
plt.plot(r, residual_d(x, y, z), label=r"$(H-E)\Delta \phi$")
plt.plot(r,
residual(x, y, z),
label=r"$(H-E)(a \phi_0 + b \Delta \phi)$")
plt.plot(r,
a * residual_0(x, y, z) + b * residual_d(x, y, z),
ls="-.",
label=r"$(H-E)(a \phi_0 + b \Delta \phi)$ (separate)")
plt.legend()
plt.show()
averaged_angular_distribution(atomlist, bound_orbitals,
continuum_orbitals, E)
# save continuum MOs to cubefiles
for i, phi in enumerate(continuum_orbitals):
def func(grid, dV):
x, y, z = grid
return phi(x, y, z)
Cube.function_to_cubefile(
atomlist,
func,
filename="/tmp/cmo_lmax_%2.2d_orb%4.4d.cube" % (lmax, i),
ppb=5.0)
#
for i, phi in enumerate(continuum_orbitals):
residual = residual_func(atomlist, phi, veff, E)
delta_e = energy_correction(atomlist,
residual,
phi,
method="Becke")
print(" orbital %d energy <%d|H-E|%d> = %e" % (i, i, i, delta_e))
l, = plt.plot(r,
phi(x, y, z),
label=r"$\phi_{%d}$ ($l_{max}$ = %d)" % (i, lmax))
plt.plot(r,
residual(x, y, z),
ls="-.",
label=r"$(H-E)\phi_{%d}$" % i,
color=l.get_color())
plt.legend()
plt.show()
def transform_turbomole_orbitals(tm_dir, dyson_file, method="atomwise", selected_orbitals=None):
"""
The molecular orbitals from a Turbomole calculation are transformed
into the basis used by DFTB. Since in DFTB there are much less atomic orbitals
this transformation is not bijective and does not conserve the normalization and
orthogonality among the MOs.
Parameters:
===========
tm_dir: directory with coord, basis and mos files
dyson_file: transformed MO coefficients for DFTB are written to this file
method: Method used to find the coefficients in the minimal basis
'atomwise': overlaps are only calculated between orbitals on the same atom (very fast).
'grid': the DFT orbital mo(r) and the minimal DFT atomic orbitals ao_i(r) are calculated
on a grid and the coefficients are obtained by minimizing the deviation
error(c_i) = integral |mo(r) - sum_i c_i ao_i(r)|^2 dr
in a least square sense (slower, but more accurate).
selected_orbitals: list of indeces (starting at 1, e.g. '[1,2,3]') of orbitals that should be transformed.
If not set all orbitals are transformed.
"""
print "Reading geometry and basis from Turbomole directory %s" % tm_dir
Data = Turbomole.parseTurbomole(tm_dir + "/coord")
atomlist = Data["coord"]
Data = Turbomole.parseTurbomole(tm_dir + "/basis")
basis_data = Data["basis"]
bs_gaussian = GaussianBasisSet(atomlist, basis_data)
# load Turbomole orbitals
try:
Data = Turbomole.parseTurbomole(tm_dir + "/mos")
orbe,orbs_turbomole = Data["scfmo"]
except IOError:
print "'mos' file not found! Maybe this is an open-shell calculation. Trying to read file 'alpha'"
Data = Turbomole.parseTurbomole(tm_dir + "/alpha")
orbe,orbs_turbomole = Data["uhfmo_alpha"]
# Which orbitals should be transformed?
if selected_orbitals == None:
selected_mos = np.array(range(0, len(orbe)), dtype=int)
else:
selected_mos = np.array(eval(selected_orbitals), dtype=int)-1
nmo = len(selected_mos)
# transform them to DFTB basis
if method == "atomwise":
T = bs_gaussian.getTransformation_GTO_to_DFTB()
orbs = np.dot(T, orbs_turbomole[:,selected_mos])
elif method == "grid":
# define grid for integration
(xmin,xmax),(ymin,ymax),(zmin,zmax) = Cube.get_bbox(atomlist, dbuff=7.0)
dx,dy,dz = xmax-xmin,ymax-ymin,zmax-zmin
ppb = 5.0 # Points per bohr
nx,ny,nz = int(dx*ppb),int(dy*ppb),int(dz*ppb)
x,y,z = np.mgrid[xmin:xmax:nx*1j, ymin:ymax:ny*1j, zmin:zmax:nz*1j]
grid = (x,y,z)
dV = dx/float(nx-1) * dy/float(ny-1) * dz/float(nz-1)
# numerical atomic DFTB orbitals on the grid
bs_atomic = AtomicBasisSet(atomlist)
aos = [bf.amp(x,y,z) for bf in bs_atomic.bfs]
nao = len(aos)
# overlaps S2_mn = <m|n>
S2 = np.zeros((nao,nao))
for m in range(0, nao):
S2[m,m] = np.sum(aos[m]*aos[m]*dV)
for n in range(m+1,nao):
S2[m,n] = np.sum(aos[m]*aos[n]*dV)
S2[n,m] = S2[m,n]
# DFT molecular orbitals on the grid
mos = [Cube.orbital_amplitude(grid, bs_gaussian.bfs, orbs_turbomole[:,i]).real for i in selected_mos]
# overlaps S1_mi = <m|i>, m is an atomic DFTB orbital, i a molecular DFT orbital
S1 = np.zeros((nao,nmo))
for m in range(0, nao):
for i in range(0, nmo):
S1[m,i] = np.sum(aos[m]*mos[i]*dV)
# Linear regression leads to the matrix equation
# sum_n S2_mn c_ni = S1_mi
# which has to be solved for the coefficients c_ni.
orbs = la.solve(S2, S1)
else:
raise ValueError("Method should be 'atomwise' or 'grid' but not '%s'!" % method)
# normalize orbitals, due to the incomplete transformation they are not necessarily
# orthogonal
dftb2 = DFTB2(atomlist)
dftb2.setGeometry(atomlist)
S = dftb2.getOverlapMatrix()
for i in range(0, nmo):
norm2 = np.dot(orbs[:,i], np.dot(S, orbs[:,i]))
orbs[:,i] /= np.sqrt(norm2)
# save orbitals
xyz_file = "geometry.xyz"
XYZ.write_xyz(xyz_file, [atomlist])
print "Molecular geometry was written to '%s'." % xyz_file
ionization_energies = -orbe[selected_mos]
save_dyson_orbitals(dyson_file, ["%d" % (i+1) for i in selected_mos], ionization_energies, orbs, mode="w")
print "MO coefficients for DFTB were written to '%s'." % dyson_file
def atomic_pz_orbital(Z, data_file):
atomlist = [(Z, (0.0, 0.0, 0.0))]
# compute molecular orbitals with DFTB
print "compute molecular orbitals with tight-binding DFT"
tddftb = LR_TDDFTB(atomlist)
tddftb.setGeometry(atomlist, charge=0)
options = {"nstates": 1}
try:
tddftb.getEnergies(**options)
except DFTB.Solver.ExcitedStatesNotConverged:
pass
valorbs, radial_val = load_pseudo_atoms(atomlist)
bound_orbs = tddftb.dftb2.getKSCoefficients()
# order of orbitals s, py,pz,px, dxy,dyz,dz2,dzx,dx2y2, so the pz-orbital has index 2
mo_bound = bound_orbs[:, 2]
tdipole_data = []
for iE, E in enumerate(slako_tables_scattering.energies):
print "PKE = %s" % E
try:
SKT_bf, SKT_ff = load_slako_scattering(atomlist, E)
except ImportError:
break
Dipole = ScatteringDipoleMatrix(atomlist, valorbs, SKT_bf).real
# dipole between bound orbital and the continuum AO basis orbitals
dipole_bf = np.tensordot(mo_bound, Dipole, axes=(0, 0))
tdip_pz_to_s = dipole_bf[0, 2] # points along z-axis
tdip_pz_to_dyz = dipole_bf[5, 1] # points along y-axis
tdip_pz_to_dz2 = dipole_bf[6, 2] # points along z-axis
tdip_pz_to_dzx = dipole_bf[7, 0] # points along x-axis
tdipole_data.append(
[E * AtomicData.hartree_to_eV] +
[tdip_pz_to_s, tdip_pz_to_dyz, tdip_pz_to_dz2, tdip_pz_to_dzx])
####
# determine the radius of the sphere where the angular distribution is calculated. It should be
# much larger than the extent of the molecule
(xmin, xmax), (ymin, ymax), (zmin, zmax) = Cube.get_bbox(atomlist,
dbuff=0.0)
dx, dy, dz = xmax - xmin, ymax - ymin, zmax - zmin
Rmax = max([dx, dy, dz]) + 500.0
print "Radius of sphere around molecule, Rmax = %s bohr" % Rmax
k = np.sqrt(2 * E)
wavelength = 2.0 * np.pi / k
print "wavelength = %s" % wavelength
valorbsE, radial_valE = load_pseudo_atoms_scattering(atomlist,
E,
rmin=0.0,
rmax=Rmax +
2 * wavelength,
Npts=90000)
# Plot radial wavefunctions
import matplotlib.pyplot as plt
plt.ion()
r = np.linspace(0.0, Rmax + 2 * wavelength, 5000)
for i, (Zi, posi) in enumerate(atomlist):
for indx, (ni, li, mi) in enumerate(valorbsE[Zi]):
# only plot the dz2 continuum orbital
if li == 2 and mi == 0 and (iE % 10 == 0):
R_spl = radial_valE[Zi][indx]
radial_orbital_wfn = R_spl(r)
plt.plot(r,
radial_orbital_wfn,
label="Z=%s n=%s l=%s m=%s E=%s" %
(Zi, ni, li, mi, E))
plt.plot(r, np.sin(k * r) / r, ls="-.")
#plt.plot(r, np.sin(k*r + 1.0/k * np.log(2*k*r))/r, ls="--", lw=2)
plt.plot(r,
np.array([
float(mpmath.coulombf(li, -1.0 / k, k * rx)) /
rx for rx in r
]),
ls="--",
lw=2,
label="CoulombF l=%s E=%s" % (li, E))
plt.draw()
####
# save table
fh = open(data_file, "w")
print >> fh, "# PKE/eV pz->s pz->dyz pz->dz2 pz->dzx"
np.savetxt(fh, tdipole_data)
fh.close()
print "Wrote table with transition dipoles to %s" % data_file
# show radial wavefunctions
plt.ioff()
plt.show()
# Which axes should be integrated out?
assert len(axes_str) == 2
ax2index = {"x": 0, "y": 1, "z": 2}
axes_integrate = [ax2index[s] for s in axes_str]
# Which axis remains?
axis_remains = None
for i in range(0,3):
if not (i in axes_integrate):
axis_remains = i
break
print "axes %s are integrated out" % str(axes_integrate)
print "remaining axis: %s" % axis_remains
# load the cube file
atomlist, origin, axes, data = Cube.readCube(cube_file)
axes = [np.array(ax) for ax in axes]
x0 = np.array(origin)
nx,ny,nz = data.shape
ns = [nx,ny,nz]
# remaining coordinate is called u
du = la.norm(axes[axis_remains])
print "du = %s" % du
nu = ns[axis_remains]
u = np.linspace(origin[axis_remains], nu*du, nu)
# shift axis so that the center is located at u=0
u = u-u[len(u)/2]
# rho(u), 1D curve after integrating
rho_u = np.zeros(ns[axis_remains])
def averaged_pad_scan(res,
initial_orbital,
energy_range,
data_file,
npts_euler=5,
npts_theta=50,
npts_r=60,
rmax=300.0,
lmax=1,
lebedev_order=23,
radial_grid_factor=3,
units="eV-Mb"):
"""
compute the photoelectron angular distribution for an ensemble of istropically
oriented molecules.
Parameters
----------
res : instance of G09ResultsDFT,
contains basis set, MO coefficients of bound orbitals
initial_orbital : index (starting from 0) of occupied orbital from which
the electron is ionized, only the alpha orbitals are used
energy_range : numpy array with photoelectron kinetic energies (PKE)
for which the PAD should be calculated
data_file : path to file, a table with PKE, SIGMA and BETAs is written
Optional
--------
npts_euler : number of grid points N for numerical integration over
molecular orientations for each Euler angle a,b,c
npts_theta : number of grid points for theta angle. The molecular frame PAD
is computed on the rotated grid for each orientation and averaged.
npts_r : number of radial grid points for integration on interval [rmax,rmax+2pi/k]
rmax : large radius at which the continuum orbitals can be matched
with the asymptotic solution
lmax : maximal angular momentum of atomic continuum orbitals and asymptotic solution.
lebedev_order : order of Lebedev grid for angular integrals
radial_grid_factor
: factor by which the number of grid points is increased
for integration on the interval [0,+inf]
units : units for energies and photoionization cross section in output, 'eV-Mb' (eV and Megabarn) or 'a.u.'
"""
# convert geometry to atomlist format
atomlist = []
for i in range(0, res.nat):
atomlist.append((res.atomic_numbers[i], res.coordinates[:, i]))
print ""
print "*******************************************"
print "* PHOTOELECTRON ANGULAR DISTRIBUTIONS *"
print "*******************************************"
print ""
# determine the radius of the sphere where the angular distribution is calculated. It should be
# much larger than the extent of the molecule
(xmin, xmax), (ymin, ymax), (zmin, zmax) = Cube.get_bbox(atomlist,
dbuff=0.0)
dx, dy, dz = xmax - xmin, ymax - ymin, zmax - zmin
# increase rmax by the size of the molecule
rmax += max([dx, dy, dz])
Npts = max(int(rmax), 1) * 50
print "Radius of sphere around molecule, rmax = %s bohr" % rmax
print "Points on radial grid, Npts = %d" % Npts
#assert res.nelec_alpha == res.nelec_beta
# create wavefunction of bound initial orbital
# MO coefficients of initial orbital
orbs_initial = res.orbs_alpha[:, initial_orbital]
#
bound_orbital = GaussianMolecularOrbital(res.basis, orbs_initial)
# compute PADs for all energies
pad_data = []
print " SCAN"
print " Writing table with betas to %s" % data_file
# table headers
header = ""
header += "# formatted checkpoint file: %s" % fchk_file + '\n'
header += "# initial orbital: %s" % initial_orbital + '\n'
header += "# npts_euler: %s npts_theta: %s npts_r: %s rmax: %s lmax: %s" % (
npts_euler, npts_theta, npts_r, rmax, lmax) + '\n'
header += "# lebedev_order: %s radial_grid_factor: %s" % (
lebedev_order, radial_grid_factor) + '\n'
if units == "eV-Mb":
header += "# PKE/eV SIGMA/Mb BETA1 BETA2 BETA3 BETA4" + '\n'
else:
header += "# PKE/Eh SIGMA/bohr^2 BETA1 BETA2 BETA3 BETA4" + '\n'
# save table
access_mode = MPI.MODE_WRONLY | MPI.MODE_CREATE
fh = MPI.File.Open(comm, data_file, access_mode)
if rank == 0:
# only process 0 write the header
fh.Write_ordered(header)
else:
fh.Write_ordered('')
for i, energy in enumerate(energy_range):
if i % size == rank:
print " PKE = %6.6f Hartree (%4.4f eV)" % (
energy, energy * AtomicData.hartree_to_eV)
# molecular continuum orbitals at energy E
continuum_orbitals, phase_shifts, lms = variational_kohn(
atomlist,
energy,
lmax=lmax,
rmax=rmax,
npts_r=npts_r,
radial_grid_factor=radial_grid_factor,
lebedev_order=lebedev_order)
# transition dipoles between bound and free orbitals
dipoles = transition_dipole_integrals(
atomlist, [bound_orbital],
continuum_orbitals,
radial_grid_factor=radial_grid_factor,
lebedev_order=lebedev_order)
### DEBUG
analyze_dipoles_angmom(dipoles, lms)
###
# compute PAD for ionization from orbital 0 (the bound orbital)
betasE = orientation_averaged_pad(dipoles[0, :, :],
continuum_orbitals,
energy,
rmax=rmax,
npts_euler=npts_euler,
npts_r=npts_r,
npts_theta=npts_theta)
if units == "eV-Mb":
energy *= AtomicData.hartree_to_eV
# convert cross section sigma from bohr^2 to Mb
betasE[0] *= AtomicData.bohr2_to_megabarn
pad_data.append([energy] + list(betasE))
# save row with PAD for this energy to table
row = "%10.6f %10.6e %+10.6e %+10.6f %+10.6e %+10.6e" % tuple(
pad_data[-1]) + '\n'
fh.Write_ordered(row)
fh.Close()
print "FINISHED"