Understanding the high neutralization yields in collisions of keV Li+ ions with copper surfaces

C. Meyer, F. Bonetto, R. Vidal, Evelina A. García, C. Gonzalez, J. Ferrón, and E. C. Goldberg
Phys. Rev. A 86, 032901 – Published 17 September 2012

Abstract

Measurements of neutral atom fractions for Li+ scattered by Cu(111) and Cu(001) surfaces as a function of the exit ion energy and exit angle are reported. Large neutralization rates (between 20% and 60%) are found in all cases. A first-principles quantum-mechanical based theoretical formalism is applied to describe the time-dependent scattering process, where neutralization to the Li ground state is considered as the unique relevant charge transfer channel during the collision. The increase of the neutralization fraction as the exit energy decreases is well described by the model. The proximity of the projectile energy level to the solid Fermi level and the large extension of the ion-surface coupling interactions, affecting a large number of surface atoms, play a decisive role in explaining the experimental yields.

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  • Received 27 April 2012

DOI:https://doi.org/10.1103/PhysRevA.86.032901

©2012 American Physical Society

Authors & Affiliations

C. Meyer1, F. Bonetto1,2, R. Vidal1,3, Evelina A. García1, C. Gonzalez4, J. Ferrón1,2, and E. C. Goldberg1,2

  • 1Instituto de Desarrollo Tecnológico para la Industria Química (INTEC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Güemes 3450, S3000GLN Santa Fe, Argentina
  • 2Departamento de Materiales, Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829, S3000AOM Santa Fe, Argentina
  • 3Departamento de Física, Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829, S3000AOM Santa Fe, Argentina
  • 4Departamento de Superficies y Recubrimientos, Instituto de Ciencia de Materiales de Madrid (CSIC), ES-28049 Madrid, Spain

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Vol. 86, Iss. 3 — September 2012

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