I am working on the simulation of electron energy loss spectroscopy (EELS). I have data from a 200 keV transmission electron microscope (TEM) and I would like to fit the EELS spectrum with the simulation.
I already tried most of the Low Energy physics list. The most promising is the Penelope physics list and MicroElectronic Physics list (only for Silicon). Unfortunately, the simulated EELS spectrum has a plasmon peak shifted into the lower energies if compared with experimental data (please see attached figure).
In the attached figure, I compared simulated and measured data. For the simulation, I used Penelope physics list and G4GeneralParticleSource with Gaussian distribution of the primary beam (The primary energy was 200 keV and the deviation was 0.7 eV). The sample was 50 nm of Si3N4 with 15 nm of Mo. For the experiment, we used the same sample and the TEM microscope with the same primary beam parameters.
I would like to ask if I can edit (tune-up) the Penelope physics list to get a simulation that would fit better with the experimental data.
Thank you very much for your time.
David