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shaim223
USA
2 Posts |
 Posted - 01/08/2016 : 11:41:44 AM
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I'm trying to carry out the deconvolution of one peak into five Gaussian peaks. After I choose the default estimate, I determine the x-positions of two peaks by double click. For example, I choose the positions of x=940 and 985. After carrying out fitting, the peak is deconvoluted into two Gaussian peaks nicely.
But, it has one serious problem for me. The positions of two deconvoluted peaks are somewhat different from the initial positions I determined. How can I do? If you have a knowledge on this problem, I would like you to let me know. Thank you for reading.
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Md Haider Shaim
email: mshai001@odu.edu
Haider |
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snowli
USA
1385 Posts |
Posted - 01/08/2016 : 12:21:24 PM
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Hello,
Could you let me know which menu did you use?
Did you choose Analysis: Peaks and Baseline: Multiple Peak Fit...? If you used that, after you double click in graph to pick peak centers, don't directly click Fit button. Choose Open NLFit button instead.
Then on Parameters tab, you can set the corresponding xc to be Fixed. Check corresponding checkbox in Fixed column.
If you don't want to set it as fixed but want it to change in a range, you can also go to Bounds tab to set so. Double click the cell in <, <= column to toggle the <, <=, or no bound.
Multiple Peak Fit tool is only for clearly defined peaks with no baseline. If you have baselines to set or etc. we recommend using Analysis: Peaks and Baseline: Peak Analyzer which will guide you step by step to do deconvolution. You can even choose different peak function for each peak.
This blog may be useful for you
http://blog.originlab.com/data-analysis/how-do-i-perform-peak-deconvolution
Thanks, Snow
OriginLab Corp. |
Edited by - snowli on 01/08/2016 12:24:07 PM |
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shaim223
USA
2 Posts |
Posted - 01/08/2016 : 12:55:47 PM
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Thank you,
Solution looks nice, I will try this. Will let you know surely if it works or I need more help.
Thanks again for quick response.
Haider |
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Gaussian multiple peak fit