Potential-energy surfaces for charge exchange between singly charged ions and a LiF surface

Ludger Wirtz, Joachim Burgdörfer, Michal Dallos, Thomas Müller, Hans Lischka

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1 Scopus citations

Abstract

We analyze the adiabatic potential-energy surfaces relevant for neutralization of singly charged ions in slow vertical incidence onto a lithium fluoride surface. The surface is represented by a cluster of varying size augmented by point charges of alternating sign in order to include the proper Madelung potential of the ionic crystal. Our calculation proceeds on the multiconfiguration self-consistent-field and multireference configuration-interaction levels. Size-consistency corrections based on the Davidson correction and multireference averaged quadratic coupled cluster methods are included as well. We emphasize the importance of a proper treatment of electron correlation signifying the polarization of the surrounding cluster environment in ab initio calculations of charge transfer at surfaces. From the topology of the surfaces, in particular the existence or absence of avoided crossings (or, more generally, conical intersections), qualitative predictions for the neutralization process can be made. The comparative analysis of potential curves for [Formula Presented] [Formula Presented] [Formula Presented] and [Formula Presented] projectiles provides an explanation for the recently observed threshold behavior for potential sputtering.

Original languageEnglish
Pages (from-to)13
Number of pages1
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume68
Issue number3
DOIs
StatePublished - 2003

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