| T O P I C R E V I E W |
| saigonthang4 |
Posted - 05/16/2008 : 02:34:26 AM
Origin Version (Select Help-->About Origin): 8.0
Operating System:
Hi
I am using Origin to analyze Raman spectra.
But I have a problem with that
I want to use Origin software to split a large peaks in Raman spectrum (G_peak of carbon nanotubes) into some small peaks with Lorentz function, however, I couldn't do that? Please help me.
Thanks for your help |
| 1 L A T E S T R E P L I E S (Newest First) |
| greg |
Posted - 05/16/2008 : 10:54:19 AM
The simplest tool is 'Fit Multi Peaks' on the Analysis : Fitting menu. (Moving to the Analysis : Peaks and Baseline menu in SR2.)
With this tool, you can designate Peak Type as Lorentz, specify your estimate of the number of peaks and then double-click on the locations you think the peaks are. Origin's fitter puts some constraints on the peak location and calculates a number of fit peaks that sum to your spectra.
For a bit more control, but a bit more work, you can use the Analysis : Fitting : Nonlinear Curve Fit. You will again need to estimate the number of peaks, plus you will need to manually enter initial parameter values. You can take control of constraints in this dialog if Fit Multi Peaks wasn't sufficient.
If you have Pro, then you can use Analysis : Spectroscopy : Peak Fit Wizard (which will be Analysis : Peaks and Baseline : Peak Analyzer in SR2). This tool includes methods for finding peaks and methods for finding and subtracting or fitting baselines. This tool is not very good in SR1, but is very good in SR2 and excellent replacement for our old PFM (Peak Fitting Module).
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