File: emt2.py

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python-ase 3.17.0-2
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from ase.calculators.emt import EMT
from ase import Atoms
from ase.build import molecule
a1 = Atoms('Au', calculator=EMT())
e1 = a1.get_potential_energy()
a2 = molecule('C6H6', calculator=EMT())
e2 = a2.get_potential_energy()
a1.translate((0, 0, 50))
a3 = a1 + a2
a3.calc = EMT()
e3 = a3.get_potential_energy()
print(e1, e2, e3, e3 - e1 - e2)
assert abs(e3 - e1 - e2) < 1e-13