Kinetic electron emission from Al surfaces by slow ions

M. Minniti, M. Commisso, A. Sindona, E. Sicilia, A. Bonanno, P. Barone, R. A. Baragiola, and P. Riccardi
Phys. Rev. B 75, 045424 – Published 19 January 2007

Abstract

We measured energy distributions of electrons emitted in the interaction of Na+ with Al surfaces at incident ion energies in the range 1504000eV. The data allow to correlate emission intensities with spectral signatures of electron excitation processes. We find a remarkable contribution to electron emission from asymmetric collisions between incoming ions that have survived neutralization at the surface and target atoms, leading to Al2p excitation via a vacancy transfer process. We observe that the total electron emission yields sharp increases by more than an order of magnitude at impact energies above the threshold for this process.

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  • Received 30 November 2006

DOI:https://doi.org/10.1103/PhysRevB.75.045424

©2007 American Physical Society

Authors & Affiliations

M. Minniti1, M. Commisso1, A. Sindona1, E. Sicilia2, A. Bonanno1, P. Barone1, R. A. Baragiola3, and P. Riccardi1,*

  • 1Laboratorio IIS, Università della Calabria and INFN-Gruppo Collegato di Cosenza-87036 Rende, Cosenza, Italy
  • 2Dipartimeto di Chimica, Università della Calabria-87036 Rende, Cosenza, Italy
  • 3Laboratory for Atomic and Surface Physics, Department of Engineering Physics, University of Virginia, Charlottesville, Virginia 22904, USA

  • *Corresponding author. Electronic address: riccardi@fis.unical.it

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Vol. 75, Iss. 4 — 15 January 2007

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