Hi Julian, This looks like an example of the Ramsauer-Townsend effect. Maybe someone who has a stronger physics background can explain it, but here is a reference. Phys Rev B, 1995, 52, 6332-6348. Sincerely, Wayne On Tue, Oct 4, 2011 at 9:08 AM, Kaiser, Julian < julian.kaiser@helmholtz-berlin.de> wrote:
Dear Ifeffit Community,
I'm trying to understand a basic question about an ordinary gold-foil in the fcc-crystal structure. If the spectra is plotted in the R-space, one will find two main-peaks at approx. 2.497 and 2.964 Angström that both should be attributed to the first shell. (see attached plot "Au_foil.pdf") Would this mean, one can find a peak-splitting in the 1st NN shell? And if yes, why? Maby I am compleately wrong and the second peak demonstrates already the second shell.(?) But I think the second shell should not start below 4.07825 Armströng. I think most of fcc metal crystals show this behavior. Of cause it also varys depending on the k-weight(kw=2 in the attachment).
Thanks a lot in advanced, Julian
------------------------------
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
Mitglied der Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren e.V.
Aufsichtsrat: Vorsitzender Prof. Dr. Dr. h.c. mult. Joachim Treusch, stv. Vorsitzende Dr. Beatrix Vierkorn-Rudolph Geschäftsführer: Prof. Dr. Anke Rita Kaysser-Pyzalla, Dr. Ulrich Breuer
Sitz Berlin, AG Charlottenburg, 89 HRB 5583
Postadresse: Hahn-Meitner-Platz 1 D-14109 Berlin
http://www.helmholtz-berlin.de
_______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit