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 Multiple peak fit with calculated peak position		  New Topic  Reply to Topic
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FelixLam

Denmark
1 Posts
Posted - 03/09/2014 :  08:33:26 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): 9.0.0 (32-bit) SR2
Operating System: Win7

Hi,

I need to analyze a batch of nearly identical X-ray line profiles (ca 200 separate line profiles) with a psdvoigt1 function. Each profile contains two peaks. No problem so far but: In X-ray diffraction analysis every peak is an overlap between a Ka1 and a Ka2 peak (from the characteristic radiation of the X-rays). Only the Ka1 peak is of physical interest and therefore both peaks have to be fit from the line profile to isolate the Ka1 peak. The position of the Ka2 peak can be calculated from the position of the Ka1 peak and the amplitude of the Ka2 peak is always half the amplitude of the Ka1 peak. There is no possibility to detect the hidden peaks with the normal peak finder (they nicely overlap with the Ka1 peak) and therefore I would like to do the following:

1. Find the peak position of both Ka1 peaks (That's easy)
2. Calculate the peak positions of both Ka2 peaks from the positions of the Ka1 peaks
3. Constrain the amplitude of the Ka2 peaks to the amplitude of the Ka1 peaks
4. Fit the 4 peaks in each line profile with the psdvoigt1 function

Is there a possibility to do this with OriginPro?

Regards
Felix
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