Fit Gaussian to spectral band

Gaussian-shaped spectral bands

There is no physical reasoning why spectral bands should be Gaussian shaped on the wavelength scale. But sometimes they are very close to being Gaussian and in this case fitting the band to a Gaussian provides a means to isolate the transition from the total spectrum.

Fit Gaussian function to spectral region using a|e

In this example an emission spectrum is decomposed into three Gaussian components.

1. Select the data cursor tool.

2. Using the data cursor tool, set the the left and right boundaries of the spectral region to fit. You add more than one data cursor to the window by pressing down the Alt key while you select the cursor points.

3. Go to Tools -> Spectral decomposition -> Fit spectral bands to Gaussian.

The result is added as a new dataset called 'Gaussfit: "Name of spectrum"' to the data listbox. The Gaussian parameters values are exported to the message board.

4. Do the same with the other spectral bands:

4a. Select new data range and go to 'Fit spectral bands to Gaussian'.

4a. Select new data range and go to 'Fit spectral bands to Gaussian'.