Contents
Scattering Potentials
# %matplotlib ipympl
import numpy as np
import matplotlib.pyplot as plt
from IPython.display import display
import ipywidgets
import ase
import abtem
abtem.config.set({"dask.lazy":False});
symbols = ["C", "N", "Si", "Au", "U"]
parametrization = abtem.parametrizations.LobatoParametrization()
potentials = parametrization.line_profiles(symbols, cutoff=2, name="potential")
scattering_factor = parametrization.line_profiles(
symbols, cutoff=3, name="scattering_factor"
)
fig, (ax1, ax2) = plt.subplots(1, 2, figsize=(8, 3))
visualization = potentials.show(ax=ax1, legend=False)
visualization.set_ylim([-1e2, 2e3])
scattering_factor.show(legend=True, ax=ax2)
fig.tight_layout()
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Si3N4_crystal = ase.Atoms(
"Si6N8",
scaled_positions=[
(0.82495, 0.59387, 0.75),
(0.23108, 0.82495, 0.25),
(0.59387, 0.76892, 0.25),
(0.40614, 0.23108, 0.75),
(0.76892, 0.17505, 0.75),
(0.17505, 0.40613, 0.25),
(0.66667, 0.33334, 0.75),
(0.33334, 0.66667, 0.25),
(0.66986, 0.70066, 0.75),
(0.96920, 0.66986, 0.25),
(0.70066, 0.03081, 0.25),
(0.29934, 0.96919, 0.75),
(0.33015, 0.29934, 0.25),
(0.03081, 0.33014, 0.75),
],
cell=[7.6045, 7.6045, 2.9052, 90, 90, 120],
pbc=True
)
Si3N4_orthorhombic = abtem.orthogonalize_cell(Si3N4_crystal)
Si3N4_orthorhombic *= (3,2,17)
potential = abtem.Potential(
Si3N4_orthorhombic,
# sampling = 0.1,
gpts=(116,132),
slice_thickness = 0.75,
parametrization = 'lobato',
projection = 'finite',
).build(
)
potential[:5].show(
project=False,
figsize=(12,4),
common_color_scale=True,
cbar=True,
);
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potential.show(
figsize=(4,6),
cbar=True
);
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