Total electron yields and stopping power of protons colliding with NaCl-type insulator surfaces II

TL;DR

This paper recalculates electron yields and stopping power for protons colliding with NaCl-type insulator surfaces, considering detailed surface lattice effects, and compares predictions with experimental data.

Contribution

It introduces a more detailed model accounting for individual ions and polarization potentials, improving accuracy over previous homogeneous potential models.

Findings

Significant differences up to 40% in electron yield and stopping power near critical incident angles.

Model predictions align well with experimental data for LiF, KI, and KCl.

Enhanced understanding of proton-surface interactions in insulators.

Abstract

We re-calculate electron yields and stopping power of protons colliding with surfaces of NaCl-type insulators. In this article, the projectile is considered to move taking into account the static and polarization potentials with all the individual ions forming the surface lattice unlike our previous work (Phys. Rev. A 75, 042904 (2007)) where the projectile was considered to move in an homogeneous planar potential. Substantial differences (up to forty percent of increment) have been found especially when the projectile incident angle approaches the critical one. We compare our prediction for electron yield and stopping power with the available experimental data for LiF, KI and KCl.