/usr/share/pyshared/ase/tasks/molecule.py is in python-ase 3.6.0.2515-1.1.
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import optparse
import numpy as np
from ase.atoms import Atoms, string2symbols
from ase.structure import molecule
from ase.tasks.task import OptimizeTask
from ase.data import covalent_radii, atomic_numbers
from ase.data import ground_state_magnetic_moments
from ase.utils.eos import EquationOfState
from ase.io.trajectory import PickleTrajectory
import ase.units as units
class MoleculeTask(OptimizeTask):
taskname = 'molecule'
def __init__(self, vacuum=3.0, cell=None, atomize=False,
bond_length=None, fit=None,
**kwargs):
"""Molecule task.
This task can calculate bond lengths and vibration frequencies
of dimer molecules."""
self.vacuum = vacuum
self.unit_cell = cell
self.atomize = atomize
self.bond_length = bond_length
self.fit = fit
OptimizeTask.__init__(self, **kwargs)
self.summary_header += [('d0', 'Ang'),
('hnu', 'meV'),
('Ea', 'eV'),
('Ea0', 'eV')]
def run(self, names1):
names = []
atoms = set()
for name in names1:
if name.lower() == 'g2':
from ase.data.g2 import molecule_names
names.extend(molecule_names)
from ase.data.g2 import atom_names
if self.atomize:
atoms.update(atom_names)
elif name.lower() == 'g2-1':
from ase.data.g2_1 import molecule_names
names.extend(molecule_names)
from ase.data.g2_1 import atom_names
if self.atomize:
atoms.update(atom_names)
else:
names.append(name)
if self.atomize:
atoms.update(self.build_system(name).get_chemical_symbols())
if self.atomize:
names.extend(atoms)
return OptimizeTask.run(self, names)
def build_system(self, name):
try:
# Known molecule or atom?
atoms = molecule(name)
if len(atoms) == 2 and self.bond_length is not None:
atoms.set_distance(0, 1, self.bond_length)
except NotImplementedError:
symbols = string2symbols(name)
if len(symbols) == 1:
magmom = ground_state_magnetic_moments[atomic_numbers[symbols[0]]]
atoms = Atoms(name, magmoms=[magmom])
elif len(symbols) == 2:
# Dimer
if self.bond_length is None:
b = (covalent_radii[atomic_numbers[symbols[0]]] +
covalent_radii[atomic_numbers[symbols[1]]])
else:
b = self.bond_length
atoms = Atoms(name, positions=[(0, 0, 0),
(b, 0, 0)])
else:
raise ValueError('Unknown molecule: ' + name)
if self.unit_cell is None:
atoms.center(vacuum=self.vacuum)
else:
atoms.cell = self.unit_cell
atoms.center()
return atoms
def fit_bond_length(self, name, atoms):
N, x = self.fit
assert N % 2 == 1
d0 = atoms.get_distance(0, 1)
distances = np.linspace(d0 * (1 - x), d0 * (1 + x), N)
energies = []
traj = PickleTrajectory(self.get_filename(name, '-fit.traj'), 'w')
for d in distances:
atoms.set_distance(0, 1, d)
energies.append(atoms.get_potential_energy())
self.check_occupation_numbers(atoms)
traj.write(atoms)
traj.close()
data = {'energy': energies[N // 2],
'distances': distances,
'energies': energies}
return data
def calculate(self, name, atoms):
if self.fit and len(atoms) == 2:
return self.fit_bond_length(name, atoms)
else:
data = OptimizeTask.calculate(self, name, atoms)
self.check_occupation_numbers(atoms)
return data
def analyse(self):
OptimizeTask.analyse(self)
for name, data in self.data.items():
if 'distances' in data:
distances = data['distances']
energies = data['energies']
fit0 = np.poly1d(np.polyfit(1 / distances, energies, 3))
fit1 = np.polyder(fit0, 1)
fit2 = np.polyder(fit1, 1)
dmin = None
for t in np.roots(fit1):
if t > 0 and fit2(t) > 0:
dmin = 1 / t
break
if dmin is None:
raise ValueError('No minimum!')
if abs(dmin) < min(distances) or abs(dmin) > max(distances):
raise ValueError('Fit outside of range! ' + \
str(abs(dmin)) + ' not in ' + \
str(distances))
emin = fit0(t)
k = fit2(t) * t**4
m1, m2 = self.create_system(name).get_masses()
m = m1 * m2 / (m1 + m2)
hnu = units._hbar * 1e10 * sqrt(k / units._e / units._amu / m)
data['minimum energy'] = emin
self.results[name][1:] = [energies[2] - emin, dmin, 1000 * hnu]
else:
self.results[name].extend([None, None])
for name, data in self.data.items():
atoms = self.create_system(name)
if len(atoms) == 1:
self.results[name].extend([None, None])
continue
eatoms = 0.0
for symbol in atoms.get_chemical_symbols():
if symbol in self.data and symbol != name:
eatoms += self.data[symbol]['energy']
else:
eatoms = None
break
ea = None
ea0 = None
if eatoms is not None:
ea = eatoms - data['energy']
if 'minimum energy' in data:
ea0 = eatoms - data['minimum energy']
self.results[name].extend([ea, ea0])
def add_options(self, parser):
OptimizeTask.add_options(self, parser)
mol = optparse.OptionGroup(parser, 'Molecule')
mol.add_option('-v', '--vacuum', type='float', default=3.0,
help='Amount of vacuum to add around isolated systems '
'(in Angstrom).')
mol.add_option('--unit-cell',
help='Unit cell. Examples: "10.0" or "9,10,11" ' +
'(in Angstrom).')
mol.add_option('--bond-length', type='float',
help='Bond length of dimer in Angstrom.')
mol.add_option('-F', '--fit', metavar='N,x',
help='Find optimal bondlength and vibration ' +
'frequency using N points and displacements from ' +
'-x % to +x %.')
mol.add_option('--atomize', action='store_true',
help='Calculate Atomization energies.')
parser.add_option_group(mol)
def parse(self, opts, args):
OptimizeTask.parse(self, opts, args)
self.vacuum = opts.vacuum
self.bond_length = opts.bond_length
self.atomize = opts.atomize
if opts.fit:
points, strain = opts.fit.split(',')
self.fit = (int(points), float(strain) * 0.01)
if opts.unit_cell:
if ',' in opts.unit_cell:
self.unit_cell = [float(x) for x in opts.unit_cell.split(',')]
else:
self.unit_cell = [float(opts.unit_cell)] * 3
def check_occupation_numbers(self, config):
"""Check that occupation numbers are integers and sum
to desired magnetic moment. """
if config.pbc.any():
return
calc = config.get_calculator()
try:
mref = abs(config.get_initial_magnetic_moments().sum())
nspins = calc.get_number_of_spins()
mcalc = 0.0
for s in range(nspins):
f = calc.get_occupation_numbers(spin=s)
if abs((f.round() - f).sum()) > 0.0001:
raise RuntimeError('Fractional occupation numbers?! ' + \
str(f) + ' for spin ' + str(s))
mcalc += abs(f).sum() * (-1)**s
mcalc = abs(mcalc)
if mref > 0.0:
if abs(mcalc - mref) > 0.0001:
raise RuntimeError('Incorrect magnetic moment?! ' + \
str(mcalc) + ' vs ' + str(mref))
except AttributeError:
pass
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