The intensity of those peaks is a function of energy, and hence the ideal way to experimentally characterize these features is to illuminate the CCD with a monochromatic beam and collect data at different energies. The CCD which was tested there was w102c3. The number of counts for both escape and fluorescence peaks normalized to the main peak are shown in Fig 4.8 as a function of energy. A simulation of the CCD response for the same energies was run using a model based on the Monte-Carlo method. For each energy point 1,000,000 photons were thrown into the CCD structure, the simulated histograms were then treated in exactly the same way as experimental data.
Solid lines are the model predictions.
For the escape peak the agreement between model and experiment is excellent. For the fluorescence peak it is reasonable, although there is an obvious discrepancy indicating that the model introduces some systematic error. The reason for that will be investigated later.