[Ifeffit] Problems during copper (II) oxide data treatment

Pedro F B D Martins pedrofbdmartins at gmail.com
Wed Sep 23 22:12:25 CDT 2015


Here follow the data (please find attached).

2015-09-23 23:46 GMT-03:00 Pedro F B D Martins <pedrofbdmartins at gmail.com>:

> Hi everyone, I’m having problems during the data treatment. The two
> samples (please find the project attached with the as-obtained data only,
> not with the following treatment) are of CuO (copper (II) oxide) were
> measured in a row and both were measured together with a reference (Cu
> foil). I have some doubts:
>
>
> 1) The first thing that I did was to calibrate the Reference of the first
> measurement (peak at maximum of first derivative). Next, I aligned the
> second Reference keeping the first reference as standard. Did I do
> correctly until now?
>
>
> 2) I removed the glitches that appeared in the pre-edge (1 glitch) and
> the EXAFS region (3 glitches) in both measurements.
>
>
> 3)  Next, I set the E0 for both samples in the background removal session
> to set the 0 (zero) point in chi(k). However, when I plot chi(k) the
> samples profile in high k values differ. I think that they should be at
> least very close considering that both are the same copper oxide standard
> and measured in sequence. Am I correct?
>
>
> 4) I've also noticed that the first measurement (Cu_o_2), when plot in
> chi(R) has a small (but significant) peak positioned at R = 1, which
> seems not be right, as bond distances are bigger (> 1.5, for example). Is
> there anything wrong or missing at background removal treatment?
>
>
> I know that it seems novice doubts but as I’m new to XAFS, it really
> intrigues me.
>
>
>
> Best regards,
>
> Pedro Martins
>
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