Face-dependent Auger neutralization and ground-state energy shift for He in front of Al surfaces

Journal Article · Fri Aug 15 00:00:00 EDT 2008 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.78.075423· OSTI ID:21143626

Wethekam, S; Winter, H ^[1]; Valdes, Diego; Monreal, R C ^[2]

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1. Institut fuer Physik, Humboldt-Universitaet zu Berlin, Brook-Taylor-Strasse 6, D-12489 Berlin (Germany)
2. Departamento de Fisica Teorica de la Materia Condendada C-V, Universidad Autonoma de Madrid, E-28049 Madrid (Spain)

He atoms and ions with keV energies are scattered under grazing angles of incidence from Al(111), Al(100), and Al(110) surfaces. Fractions of surviving ions and normal energy gains of He{sup +} ions prior to neutralization, derived from shifts of angular distributions for incident atoms and ions, are compared to results from three-dimensional Monte Carlo simulations based on theoretically calculated Auger neutralization rates and He ground-state energy shifts. From the good agreement of experimental data with simulations, we conclude a detailed microscopic understanding for a model system of ion-surface interactions. Our work provides further evidence for the recently reported surface Miller index dependence for the neutralization of He{sup +} ions at metal surfaces. The study is extended to the face dependence of the He ground-state energy shift.

• OSTI ID: 21143626
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 78, Issue 7; Other Information: DOI: 10.1103/PhysRevB.78.075423; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM
ANGULAR DISTRIBUTION
ATOM-ATOM COLLISIONS
ATOMS
AUGER EFFECT
BEAM NEUTRALIZATION
COMPUTERIZED SIMULATION
GROUND STATES
HELIUM
HELIUM IONS
INCIDENCE ANGLE
INDEXES
INTERACTIONS
ION-ATOM COLLISIONS
KEV RANGE
LATTICE PARAMETERS
MONTE CARLO METHOD
SURFACES
THREE-DIMENSIONAL CALCULATIONS