Velocity dependence of {ital KLL} Auger emission from hollow atoms formed during collisions of hydrogenic N{sup 6+} ions on surfaces

Journal Article · Mon May 01 04:00:00 EDT 1995 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.51.3873· OSTI ID:44660

Limburg, J; Schippers, S; Hughes, I; Hoekstra, R; Morgenstern, R ^[1]; Hustedt, S; Hatke, N; Heiland, W ^[2]

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1. Kernfysisch Versnneller Institute, Zernikelaan 25, 9747 AA Groningen (Netherlands)
2. Universitaet Osnabrueck, D-4500 Osnabrueck (Germany)

This paper presents a detailed description of {ital KLL} Auger spectra arising from collisions of hydrogenic N{sup 6+} ions on clean Si(100) and Al(110) surfaces at energies ranging from 78 eV up to 60 keV and at incident angles from 2.5{degree} up to 45{degree}. Atomic structure calculations of {ital KLL} Auger energies and decay rates for hollow atoms, together with simulations of the projectile trajectories, support a model in which the de-excitation of the ions proceeds essentially via two mechanisms. Before the ion enters the ``close collision range,`` a few of its {ital L}-shell vacancies are filled by Auger cascades involving outer shell electrons. But as seen as the projectile suffers close collisions, {ital L}-shell vacancies are rapidly filled by direct capture of target core electrons. The time scale of the latter mechanism is determined by the collision frequency.

• OSTI ID: 44660
• Journal Information: Physical Review A, Journal Name: Physical Review A Journal Issue: 5 Vol. 51; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALUMINIUM
AUGER EFFECT
CRYSTAL FACES
ENERGY DEPENDENCE
INNER-SHELL EXCITATION
ION COLLISIONS
KEV RANGE
MULTICHARGED IONS
NITROGEN
PARTICLE PRODUCTION
SILICON
YIELDS