Maxwellian distribution

Presentation

This is a model for emission energy distribution of SEs. It does not take into account incidence angle of PEs.

Input files

You must provide an emission energy distribution at normal incidence. Currently, the fitting on several emission distribution files at different PE energies is not supported.

	Emission Yield	Emission energy distribution	Emission angle distribution
“True” secondaries	❌	✅	❌
Elastically backscattered	❌	❌	❌
Inelastically backscattered	❌	❌	❌
Total	❌	❌	❌

Definitions

Emission energy distribution is given by:

\[f(E_\mathrm{SE}) = 2 \sqrt{\frac{E_\mathrm{SE}}{\pi T^3}} \mathrm{e}^{-E_\mathrm{SE}/T}\]

\(T\) is the distribution temperature in \(\mathrm{eV}\). In order to set it’s maximum to unity, we scale it by its maximum, at \(E_\mathrm{SE} = T/2\).

Model parameters

The parameters list is dynamically created here: Maxwellian API documentation.

To-do list

Todo

Allow fitting on several distribution files with different PE energy.
Consistent input files with Chung Everhart. SEs or all?