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.File in questo prodotto:
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