Thermally Enhanced Neutralization in Hyperthermal Energy Ion Scattering

TL;DR

This paper investigates how increasing surface temperature enhances neutralization probabilities of hyperthermal Na+ ions scattered from Cu(001), revealing velocity-dependent charge transfer regimes and supporting a model based on the Newns-Anderson Hamiltonian.

Contribution

It demonstrates the significant impact of surface temperature on ion neutralization and validates a temperature- and velocity-dependent charge transfer model for hyperthermal ion scattering.

Findings

Neutralization probability increases with surface temperature.

Velocity-dependent charge transfer regimes are identified.

Model based on Newns-Anderson Hamiltonian agrees with experimental data.

Abstract

Neutralization probabilities are presented for hyperthermal energy Na+ ions scattered from a Cu(001) crystal as a function of surface temperature and scattered velocity. A large enhancement in neutralization is observed as the temperature is increased. Velocity-dependent charge transfer regimes are probed by varying the incident energy, with the most prominent surface temperature effects occurring at the lowest energies. The data agree well with results obtained from a model based on the Newns-Anderson Hamiltonian, where the effects of both temperature and velocity are incorporated.