Dear Prof. Laurence Marks<br />
<br />
Thanks for the valuable information.<br />
<br />
With regards,<br />
<br />
Piyush Dua<br />
<br />
On Thu, 06 May 2010 17:13:21 +0530 wrote<br />
>SeeĀ J. Ciston, A. Subramanian, D. Kienzle, L. D. Marks, Surface Science 604 (2010) 155. and the references therein,<br />
<br />
<br />
2010/5/6 Piyush Dua <piyushdua.ph@rediffmail.com><br />
<br />
Dear Wien users,<br />
<br />
<br />
<br />
I am using PBE-Fock-alpha, in which alpha=0.25 corresponds to PBE0.<br />
<br />
If I increase alpha, in certain cases, I use to get better results.<br />
<br />
For example the band-gap is better.<br />
<br />
<br />
<br />
I would like to know, upto what limit can one extend the alpha and what will be the physical explanation of increasing alpha?<br />
<br />
<br />
<br />
Thanking you in anticipation.<br />
<br />
<br />
<br />
With regards,<br />
<br />
<br />
<br />
Piyush Dua<br />
<br />
<br />
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<br />
-- <br />
Laurence Marks<br />
Department of Materials Science and Engineering<br />
MSE Rm 2036 Cook Hall<br />
2220 N Campus Drive<br />
Northwestern University<br />
Evanston, IL 60208, USA<br />
<br />
Tel: (847) 491-3996 Fax: (847) 491-7820<br />
email: L-marks at northwestern dot edu<br />
Web: www.numis.northwestern.edu<br />
Chair, Commission on Electron Crystallography of IUCR<br />
<br />
www.numis.northwestern.edu/<br />
Electron crystallography is the branch of science that uses electron scattering and imaging to study the structure of matter.<br />
<br />
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