[Pw_forum] ion calculation
marzari at MIT.EDU
Sat Jun 10 16:26:59 CEST 2006
the total energy calculated for an infinite periodic system is well
for a neutral unit cell.
By controlling and changing the number of electrons in CP or PWSCF, you can
describe an ion, but in order to maintain neutrality the code adds a uniform
background charge of opposite sign.
For an isolated system, you obtain the correct result in the limit of
large unit cells;
this limit is reached fast if you add your own multipole corrections.
For the case
of a bulk system, the story is a more complex - start by reading the
of 1995, and then some of the more recent works in PRL by Peter Schultz.
Lin Zhuang wrote:
> Dear Espresso users,
> I wonder whether Espresso can deal with ion, if yes, how to define an
> ion as we usually do for an atom?
> Any advice will be greatly appreciated.
> best regards,
> Pw_forum mailing list
> Pw_forum at pwscf.org
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