[Ifeffit] Au-foil (fcc) splitted peak

[Wayne Lukens Jr]

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 at 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
>
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