Hi Julian,<div><br></div><div>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.</div><div><br></div><div>Phys Rev B, 1995, 52, 6332-6348.</div>

<div><br></div><div>Sincerely,</div><div><br></div><div>Wayne<br><br><div class="gmail_quote">On Tue, Oct 4, 2011 at 9:08 AM, Kaiser, Julian <span dir="ltr">&lt;<a href="mailto:julian.kaiser@helmholtz-berlin.de">julian.kaiser@helmholtz-berlin.de</a>&gt;</span> wrote:<br>

<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">




<div>
<div style="direction:ltr;font-family:Tahoma;color:#000000;font-size:10pt"><span style="background-color:white"><span lang="en-US"><font face="Calibri,sans-serif" size="2"><span style="font-size:11pt"><span lang="de">Dear Ifeffit Community,<br>


<br>
I&#39;m trying to understand a basic question about an ordinary gold-foil in the fcc-crystal structure.<br>
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 &quot;Au_foil.pdf&quot;)<br>
Would this mean, one can find a peak-splitting in the 1st NN shell? And if yes, why?<br>
Maby I am compleately wrong and the second peak demonstrates already the second shell.(?)<br>
But I think the second shell should not start below 4.07825 Armströng.<br>
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).<br>
<br>
Thanks a lot in advanced,<br>
Julian<br>
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