Charge-transfer reactions in atom scattering from ionic surfaces: A time-dependent wavepacket approach

G. R. Darling, Y. Zeiri, R. Kosloff

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

A diabatic description of charge transfer between atoms and ionic surfaces is presented, specifically examining the F/LiF(100) and F/KI(100) systems for which experiment shows ion formation to be very efficient. Potential energy surfaces describing the energetics for these systems have been generated with a semi-empirical scheme. At the site of charge exchange, there is a curve-crossing between the ground state and the state representing charge capture by the projectile. Quantum dynamics calculations with time-dependent wavepacket methods give an initial ion-formation probability of unity for all cases considered. At lowest energies, the ions cannot escape the surface, giving an effective threshold for negative-ion production very close to that observed in experiment. Re-neutralization by charge transfer back to the conduction band of the solid is also examined.

Original languageEnglish
Pages (from-to)41-54
Number of pages14
JournalFaraday Discussions
Volume117
DOIs
StatePublished - 1 Jan 2000
Externally publishedYes

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