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Title: Spin-dependent electron emission from metals in the neutralization of He{sup +} ions

Abstract

We calculate the spin-polarization of electrons emitted in the neutralization of He{sup +} 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{sup +} 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{sup +} ion neutralization process and on the electronic properties of the surface.

Authors:
;  [1];  [2];  [3];  [1]
  1. Donostia International Physics Center DIPC, P. Manuel de Lardizabal 4, 20018 San Sebastian (Spain)
  2. Departamento de Fisica de Materiales Facultad de Quimicas, UPV/EHU, Apartado 1072, 20080 San Sebastian (Spain)
  3. Unidad de Fisica de Materiales Centro Mixto CSIC-UPV/EHU, Facultad de Quimicas, UPV/EHU, Apartado 1072, 20080 San Sebastian (Spain)
Publication Date:
OSTI Identifier:
20718240
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 72; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevA.72.024901; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ALUMINIUM; AUGER EFFECT; CATIONS; COPPER; DISTURBANCES; ELECTRON EMISSION; ELECTRON-ELECTRON COLLISIONS; ELECTRON-ELECTRON INTERACTIONS; ELECTRONS; EXCITATION; GOLD; HELIUM IONS; PARAMAGNETISM; SPIN; SPIN ORIENTATION; SURFACE POTENTIAL; SURFACES; YIELDS

Citation Formats

Alducin, M, Roesler, M, Juaristi, J I, Unidad de Fisica de Materiales Centro Mixto CSIC-UPV/EHU, Facultad de Quimicas, UPV/EHU, Apartado 1072, 20080 San Sebastian, Muino, R Diez, Echenique, P M, Departamento de Fisica de Materiales Facultad de Quimicas, UPV/EHU, Apartado 1072, 20080 San Sebastian, and Unidad de Fisica de Materiales Centro Mixto CSIC-UPV/EHU, Facultad de Quimicas, UPV/EHU, Apartado 1072, 20080 San Sebastian. Spin-dependent electron emission from metals in the neutralization of He{sup +} ions. United States: N. p., 2005. Web. doi:10.1103/PhysRevA.72.024901.
Alducin, M, Roesler, M, Juaristi, J I, Unidad de Fisica de Materiales Centro Mixto CSIC-UPV/EHU, Facultad de Quimicas, UPV/EHU, Apartado 1072, 20080 San Sebastian, Muino, R Diez, Echenique, P M, Departamento de Fisica de Materiales Facultad de Quimicas, UPV/EHU, Apartado 1072, 20080 San Sebastian, & Unidad de Fisica de Materiales Centro Mixto CSIC-UPV/EHU, Facultad de Quimicas, UPV/EHU, Apartado 1072, 20080 San Sebastian. Spin-dependent electron emission from metals in the neutralization of He{sup +} ions. United States. https://doi.org/10.1103/PhysRevA.72.024901
Alducin, M, Roesler, M, Juaristi, J I, Unidad de Fisica de Materiales Centro Mixto CSIC-UPV/EHU, Facultad de Quimicas, UPV/EHU, Apartado 1072, 20080 San Sebastian, Muino, R Diez, Echenique, P M, Departamento de Fisica de Materiales Facultad de Quimicas, UPV/EHU, Apartado 1072, 20080 San Sebastian, and Unidad de Fisica de Materiales Centro Mixto CSIC-UPV/EHU, Facultad de Quimicas, UPV/EHU, Apartado 1072, 20080 San Sebastian. 2005. "Spin-dependent electron emission from metals in the neutralization of He{sup +} ions". United States. https://doi.org/10.1103/PhysRevA.72.024901.
@article{osti_20718240,
title = {Spin-dependent electron emission from metals in the neutralization of He{sup +} ions},
author = {Alducin, M and Roesler, M and Juaristi, J I and Unidad de Fisica de Materiales Centro Mixto CSIC-UPV/EHU, Facultad de Quimicas, UPV/EHU, Apartado 1072, 20080 San Sebastian and Muino, R Diez and Echenique, P M and Departamento de Fisica de Materiales Facultad de Quimicas, UPV/EHU, Apartado 1072, 20080 San Sebastian and Unidad de Fisica de Materiales Centro Mixto CSIC-UPV/EHU, Facultad de Quimicas, UPV/EHU, Apartado 1072, 20080 San Sebastian},
abstractNote = {We calculate the spin-polarization of electrons emitted in the neutralization of He{sup +} 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{sup +} 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{sup +} ion neutralization process and on the electronic properties of the surface.},
doi = {10.1103/PhysRevA.72.024901},
url = {https://www.osti.gov/biblio/20718240}, journal = {Physical Review. A},
issn = {1050-2947},
number = 2,
volume = 72,
place = {United States},
year = {Mon Aug 15 00:00:00 EDT 2005},
month = {Mon Aug 15 00:00:00 EDT 2005}
}