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Fitting a simple peak
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In this first example, there is no background and the peak can be fitted to a simple shape. The solid line is a Gaussian fit to the recorded peak.

Fit parameters:
Area of Gaussian = N, the number of counts in the peak.
s = sample standard deviation of the counts.
Gaussian peak position Pg = centroid of counts.

The quality of the fit can be obtained by examining the chi squared distribution (C2).

Vary the parameter Pg and see how C2 changes.

The uncertainty in Pg can be estimated from a full plot of C2 against Pg (next)

 

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1999, 2000 The University of Liverpool, Department of Physics

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