Here we see a schematic diagram showing a retarding potential Mott analyzer.

The retarding potential here is represented by gridded rings, but could be a set of apertured plates.

Here we see Left-Right asymmetry A vs. foil thickness t at several incident electron energies.

Open Circles - Our Monte-Carlo results without any adjustable parameters.
Closed Circles - Experimental data of Gay et al. (1992).
Closed Triangles - Experimental data of Uhrig et al. (1992).

As an illustration of how sensitive A (left-right asymmetry) is to the inelastic (in this case "Black-Hole") cross-section (our only adjustable parameter), we vary the inelastic cross-section and show how rapidly the A vs. t varies as the inelastic cross-section is changed.

We use a fixed inelastic cross-section already published by Misell (1973) obtained from electron microscopy studies using gold foils.