[Pw_forum] add or remove electron energy

[kazempoor at ph.iut.ac.ir]

Dear Stefano

I now that these are affinity and ionization, But I don't understand why ionization always is grater than affinity? I just want to know the physical reason.



Thanks a lot




Ali Kazempour
Physics Department, Isfahn University of Technology

----- Original Message -----
From: "Stefano de Gironcoli" <degironc at sissa.it>
To: "PWSCF Forum" <pw_forum at pwscf.org>
Sent: Monday, May 3, 2010 6:10:25 PM
Subject: Re: [Pw_forum] add or remove electron energy

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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