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 Fitting of Kinetic Trace with convolution		  New Topic  Reply to Topic
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quantusenor

USA
1 Posts
Posted - 04/05/2019 :  6:00:55 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hello everyone. I am trying to fit my Kinetic Trace using the tutorial Fitting with convolution. I am total zero at coding, so when I try to write my own function, it doesn't work. The function I am using is tri-exponential-decay:
y=a1*exp(-(x-t0)/t1)+a2*exp(-(x-t0)/t2)+a3*exp(-(x-t0)/t3)


The purpose of whole fitting is to determine extinction coefficients of excited states, which can be found from pre-exponential coefficients.

I was thinking maybe I can deconvolute my trace and then fit in into Tri-exponential decay function?
Edited by - quantusenor on 04/05/2019 6:02:43 PM

Sam Fang

293 Posts
Posted - 04/08/2019 :  05:19:08 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Origin provides Fit Convolution App for it, it needn't coding, and you can download and try it:
https://www.originlab.com/fileExchange/details.aspx?fid=423

The worksheet should include three columns like the tutorial: first column for x, second column for y (convoluted signal), and third column for impulse response (e.g. Gaussian).

Note that over-parameterization existed in your tri-exponential decay function. You can fix t0.

Sam
OriginLab Technical Services
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