Post-collision interaction in the liquid phase: the role of electron scattering

TL;DR

This study investigates post-collision interaction (PCI) of Auger electrons in liquids, highlighting the roles of screening and electron scattering, and demonstrates improved modeling with Monte-Carlo simulations.

Contribution

It introduces a Monte-Carlo based approach to model electron scattering in PCI, improving agreement with experimental data in liquid media.

Findings

PCI behavior is similar across different ions and solvents.

Scattering and screening are key factors affecting PCI.

Monte-Carlo simulations enhance modeling accuracy.

Abstract

We report a detailed study of post-collision interaction (PCI) in a liquid medium. We investigate PCI for the Auger KLL electrons of solvated Cl$^-$, K$^+$ and Ca$^{2+}$. All three isoelectronic ions exhibit a very similar PCI behavior, which is little affected by changing the solvent from water to methanol or ethanol. The two main factors modifying the PCI interaction in condensed media is the screening of Coulombic interactions, and scattering of the electrons. The experimental results are compared with the predictions of a previously reported semi-classical PCI theory modified to account for screening and scattering. We show that a better agreement with experiment can be obtained by instead modeling scattering using electron transport Monte-Carlo simulations. We suggest that, in turn, PCI experimental data could be used as another experimental constraint to refine the currently insufficiently well-known scattering parameters of low-energy electrons in water, which are crucial in many fields.