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# Select Bravais lattice and define lattice constants
bravais_lattice = SimpleCubic(
    a=4*Units.Angstrom
    )

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CH4-mole.py
from ATK.KohnSham import *
# Define elements
elements = [Carbon,   Hydrogen, Hydrogen, Hydrogen,
            Hydrogen]

# Define coordinates
coordinates = [[  3.45550642e-09,   1.19410352e-05,  -1.31631681e-05],
               [ -6.28788060e-01,   6.61296564e-01,   5.99709498e-01],
               [  6.30445237e-01,  -5.99739608e-01,   6.59760796e-01],
               [  6.30352985e-01,   5.98024259e-01,  -6.61261220e-01],
               [ -6.32010202e-01,  -6.59723506e-01,  -5.98052220e-01]]*Angstrom


# Set up configuration
molecule_configuration = MoleculeConfiguration(elements,coordinates)



CH4-bulk.py
from ATK.KohnSham import *

# Select Bravais lattice and define lattice constants
bravais_lattice = SimpleCubic(
    a=4*Units.Angstrom
    )

# Define bulk elements and unit cell coordinates
elements = [Carbon,   Hydrogen, Hydrogen, Hydrogen,
            Hydrogen]
coordinates = [[  3.45550633e-09,   1.19410352e-05,  -1.31631678e-05],
               [ -6.28788054e-01,   6.61296546e-01,   5.99709511e-01],
               [  6.30445242e-01,  -5.99739611e-01,   6.59760773e-01],
               [  6.30352974e-01,   5.98024249e-01,  -6.61261201e-01],
               [ -6.32010221e-01,  -6.59723520e-01,  -5.98052204e-01]]*Angstrom


# Set up bulk configuration
bulk_configuration = BulkConfiguration(
    bravais_lattice,
    elements,
    cartesian_coordinates=coordinates
    )


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