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.. module:: gpaw.external
External potential
==================
Examples
--------
>>> # 2.5 eV/Ang along z:
>>> from gpaw.external import ConstantElectricField
>>> calc = GPAW(external=ConstantElectricField(2.5, [0, 0, 1]), ...)
.. autoclass:: ConstantElectricField
>>> # Two point-charges:
>>> from gpaw.external import PointChargePotential
>>> pc = PointChargePotential([-1, 1], [[4.0, 4.0, 0.0], [4.0, 4.0, 10.0]])
>>> calc = GPAW(external=pc, ...)
.. autoclass:: PointChargePotential
Your own potential
------------------
See an example here: :git:`gpaw/test/ext_potential/test_harmonic.py`.
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