It's possible that your data really has a kink in it. Zoom in on that last bit in E space before any background subtraction and see if there's something odd-looking. If there's really an artifactual kink, then there's not much you can do. mam On 10/29/2020 7:47 AM, Carlo Segre wrote:

I agree, this is a sign of a poor background subtraction.  I find that this can be mitigated by cutting back on your spl;ine range for background subtraction.  Change it by 0.5 at a time or less and keep plotting in k-space.  You might have to lose a bit of range but that just means that the data is not good enough to extend that far.

Carlo

On Thu, Oct 29, 2020 at 9:23 AM Edmund Welter mailto:edmund.welter@desy.de> wrote:

Dear Danting,

did you look on the background that is subtracted? I guess it is your background that is doing something weird here. To look at the background tick "Background" in the plot. In the region you mention it should be a smooth line without visible oscillations.

Cheers,

Edmund

On 29.10.20 11:02, Chen, Danting wrote:

...

Hi Mr/Ms,

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I am a new learner of XAS and meet a problem like before and hope you can give me some hints.

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I have a data set after merged and alignment. But at 11-13 A-1, the amplitude of k is much higher than normal but there seems no weird points at XAS spectrum. I wonder how I could deal with this part? If I shorter kmax and it must lose some important information.

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Best Wishes,

Danting

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