Curve-crossing analysis for potential sputtering of insulators

L. Wirtz1, G. Hayderer2, C. Lemell1, J. Burgdörfer1, L. Hägg3, C.O. Reinold4, P. Varga2, H.P. Winter2, F. Aumayr2

1Institut für Theoretische Physik, Technische Universität Wien, A-1040 Wien, Austria
2Institut für Allgemeine Physik, Technische Universität Wien, A-1040 Wien, Austria
3Department of Physics and Mathematics, Mid Sweden University, S-85170 Sundsvall, Sweden
4Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6373, U.S.A.

Surf. Sci. 451 (2000) 197-202

We develop a theoretical model for the recently observed threshold for potential sputtering of LiF by slow singly and doubly charged ions. The threshold coincides with the potential energy to create a cold hole in the valence band of LiF by resonant neutralization. We calculate the level shift of the incident ion and the deformation of the valence band under the influence of the projectile. Resonant neutralization becomes possible for ions with recombination energies larger than 10 eV in agreement with the experimental findings.

Corresponding author: F. Aumayr (aumayr< encoded email address >).

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