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Spin-dependent electron emission from metals in the neutralization of He+ ions

AuthorsAlducin Ochoa, Maite ; Juaristi Oliden, Joseba Iñaki ; Díez Muiño, Ricardo ; Rösler, M.; Echenique, Pedro M.
Issue Date2005
PublisherAmerican Physical Society
CitationPhysical Review A 72(2): 024901 (2005)
AbstractWe calculate the spin-polarization of electrons emitted in the neutralization of He+ ions interacting with metals. All stages of the emission process are included: the spin-dependent perturbation induced by the projectile, the excitation of electrons in Auger neutralization processes, the creation of a cascade of secondaries, and the escape of the electrons through the surface potential barrier. The model allows us to explain in quantitative terms the measured spin-polarization of the yield in the interaction of spin-polarized He+ ions with paramagnetic surfaces, and to disentangle the role played by each of the involved mechanisms. We show that electron-electron scattering processes at the surface determine the spin-polarization of the total yield. High energy emitted electrons are the ones providing direct information on the He+ ion neutralization process and on the electronic properties of the surface. © 2005 The American Physical Society.
Identifiersdoi: 10.1103/PhysRevA.72.024901
issn: 1050-2947
e-issn: 1094-1622
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