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Hi Brandon,<br>
before someone gives you correct answer, could you shortly inform
us, what is the E0 for reference foil, for each experimental data.
As I understand you have a shift of 7eV between samples, but
measured on samples, thus would be nice to see what is the shift for
reference.<br>
The second question comes for me automatically - have you done
something with the beamline set-up between experiments ?<br>
kicaj<br>
<br>
W dniu 11-06-06 08:56, Brandon Reese pisze:
<blockquote
cite="mid:BANLkTimy23y9FZSb75P=r3GCDjbXZXri2A@mail.gmail.com"
type="cite">Hi all,<br>
<br>
I am looking at EXAFS of thin film metal oxides. I am varying
both metal content and the oxygen content of the films. I aligned
the scans with a metal reference foil collected simultaneously.
In Artemis, I have noticed that when changing between films with
no extra oxygen versus those with extra oxygen there is a shift in
the fitted E0 of ~1.5 eV (after aligning to the foil). I tried
setting the E0 in Athena to the peak of the 1st derivative and the
peak of the white line with the same result (~7 eV difference). I
was a little surprised by the offset because in Athena the E0
values varied by <0.5 eV. I am not sure if the argument could
be made that this shift is a result in a changing oxidation state
because it doesn't show up in the XANES (at least qualitatively).
Are there other experimental effects that could cause a shift like
this, or is this likely something real in my material? If anyone
want to see a representative group of data, let me know.<br>
<br>
I also have an unrelated quick (I think) question on the EXAFS
equation. In some references I see a term 1/(k R)^2 and in others
it is 1/(k R^2). I couldn't really see any reason for the
difference, unless it is to correct for subtle differences in how
the other terms are defined.<br>
<br>
Thanks<br>
Brandon<br>
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