We measured energy distributions of electrons emitted in the interaction of Na+ with Al surfaces at incidention energies in the range 150–4000 eV. The data allow to correlate emission intensities with spectral signaturesof electron excitation processes. We find a remarkable contribution to electron emission from asymmetriccollisions between incoming ions that have survived neutralization at the surface and target atoms, leading toAl-2p excitation via a vacancy transfer process. We observe that the total electron emission yields sharpincreases by more than an order of magnitude at impact energies above the threshold for this process.

Kinetic electron emission from Al surfaces by slow ions

SINDONA, Antonio;SICILIA, Emilia;BONANNO A;RICCARDI, Pierfrancesco
2007-01-01

Abstract

We measured energy distributions of electrons emitted in the interaction of Na+ with Al surfaces at incidention energies in the range 150–4000 eV. The data allow to correlate emission intensities with spectral signaturesof electron excitation processes. We find a remarkable contribution to electron emission from asymmetriccollisions between incoming ions that have survived neutralization at the surface and target atoms, leading toAl-2p excitation via a vacancy transfer process. We observe that the total electron emission yields sharpincreases by more than an order of magnitude at impact energies above the threshold for this process.
2007
Atomic, molecular, and ion beam impact and interactions with surfaces ; Ion scattering from surfaces (charge transfer, sputtering, SIMS) ; Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/138911
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