Peak Fitting with Baseline

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In OriginPro, the Peak Analyzer is capable of performing multiple peak fitting with several baseline subtraction options.

There are various ways to create a baseline for your spectrum data. You can select a few anchor points and then fit them with a function. The fitting of the baseline can be done along with the peak fitting.

What You Will Learn

  • How to perform fitting of peaks
  • How to fit the baseline


  1. Start a new worksheet and import the file <Origin Program Folder>\Samples\Spectroscopy\Peaks on Exponential Baseline.dat.
  2. Highlight the second column in the worksheet.
    Peak Fitting with Baseline 01.png
  3. Select Analysis: Peaks and Baseline: Peak Analyzer from the main menu to open the Peak Analyzer.
  4. Select the Fit Peaks radio button in the Goal group on the first page.
    Peak Fitting with Baseline 02.png
  5. Click Next to go to the Baseline Mode page. In the Baseline Mode page, select User Defined from the Baseline Mode drop-down list. Click the Find button in the Baseline Anchor Points group. Eight anchor points should be found.
    Peak Fitting with Baseline 03.png
  6. Click Next to go to the Create Baseline page. In the Create Baseline page, select Fitting with the Connect By drop-down list. In the Fitting group, select ExpDec2 from the Function drop-down list.
    Peak Fitting with Baseline 04.png
  7. Click Next to go to the Baseline Treatment page. In the Baseline Treatment page, select the Fit Baseline with Peaks check box.
    Peak Fitting with Baseline 05.png
  8. Click Next to go to the Find Peaks page. In the Find Peaks page, click the Find button to search peaks. Two peaks should be found.
    Peak Fitting with Baseline 06.png
  9. Click Next to go to the Fit Peaks page. In the Fit Peaks page, click the Fit Control button to open the Peak Fit Parameters dialog.
  10. In the Peak Fit Parameters dialog, make sure that both peak types are Gaussian. Click the Fit Until Converge button.
    Peak Fitting with Baseline 07.png
  11. When the fitting is done, click OK to close this dialog.
  12. Back to the Fit Peaks page, click Finish to complete the analysis. See the results in the source workbook and the graph report.