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 Two-peak Gaussian function		  New Topic  Reply to Topic
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ccjohntsai

2 Posts
Posted - 01/31/2011 :  02:27:44 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Analysis->Peaks and baseline -> Fit multiple peaks ->
Data type: Gaussian
Number of peaks: 2.

How can I write the equation of two-peak Gaussian function in my research papers ? Or I just need to mention that two-peak function is the convolution of Single Gaussian mode ?

For single peak:
http://originlab.com/www/helponline/Origin/en/UserGuide/Fit_Single_Multi_peak(s).html

VincentLiu

China
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Posted - 02/01/2011 :  04:03:20 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Do you mean you want to know the exact function we used for fitting multiple peaks?

Vincent
Originlab Technical Services
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easwar

USA
1964 Posts
Posted - 02/01/2011 :  11:11:38 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

What that tool does is to fit the data with a combination/sum of multiple peak functions, each with its own width, center and amplitude, but with a shared y offset.

So for two peaks, with function set to gauss, the equation would be:
y = y0 + (A1/(w1*sqrt(PI/2)))*exp(-2*((x-xc1)/w1)^2) + (A2/(w2*sqrt(PI/2)))*exp(-2*((x-xc2)/w2)^2)

Easwar
OriginLab
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ccjohntsai

2 Posts
Posted - 02/03/2011 :  09:09:48 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thank you very much.
It is a great help to me.
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