[Ifeffit] [Ext] Re: XAS question

[Matthew Marcus]

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 <edmund.welter at desy.de 
> <mailto:edmund.welter at 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,
>>
>>     __ __
>>
>>     I am a new learner of XAS and meet a problem like before and hope
>>     you can give me some hints.
>>
>>     __ __
>>
>>     __ __
>>
>>     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.
>>
>>     __ __
>>
>>     Best Wishes,
>>
>>     Danting
>>
>>     Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986>
>>     for Windows 10
>>
>>     __ __
>>
>>
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> 
> -- 
> Carlo U. Segre -- Duchossois Leadership Professor of Physics
> Director, Center for Synchrotron Radiation Research and Instrumentation
> Illinois Institute of Technology
> Voice: 312.567.3498            Fax: 312.567.3494
> segre at iit.edu <mailto:segre at iit.edu> http://phys.iit.edu/~segre 
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> 
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