[Pw_forum] add or remove electron energy

[Stefano de Gironcoli]

it is the difference between electron affinity and ionization potential.
stefano

kazempoor at ph.iut.ac.ir wrote:
> Dear All
> I add one electron to an isolated atom and the difference in E(n+1)-E(n)=-0.09 Ryd but when I remove an electron from this atom 
> I got E(n)-E(n-1)=-0.349 Ryd.
> what is the reason for this difference? I think that this behavior is same for every system.
> Thanks a lot 
> Ali Kazempour
> Physics Department, Isfahan University of Technology
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