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 Multiple Peak Lorentz Fitting with associated area		  New Topic  Reply to Topic
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Mikey123

Albania
Posts
Posted - 02/14/2006 :  10:50:41 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.5
Operating System: Win XP

Hi

I'm trying to fit 3 lorentz peaks to an experimental plot. Through theory I know the relative intensities of the peaks. Is there a way to related the 3 peaks so that the area's can depend upon each other.

i.e. A1=[variable]; A2=6*A1; A3=9*A1.

Thanks
Mike

easwar

USA
1964 Posts
Posted - 02/14/2006 :  2:11:17 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Mike,

You can specify constraints in the advanced NLSF curve fitting tool.

If you are performing the multiple lorentzian fit from the Analys->Filt Multi-peaks->Lorentzian menu item, at the end of the process press CTRL-Y to bring up the NLSF dialog. Go to the Options->Constraints page in the tool and enter your constraint:
A2=6*A1; A3=9*A1;
Make sure to check the "Enabled" check box and then proceed to Action->Fit page to fit with this constraint in place. You can then click Done once the fit converges to get the new result etc.

Easwar
OriginLab
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