Angular distribution of Rh atoms desorbed from ion-bombarded Rh l brace 100 r brace : Effect of local environment

Journal Article · Mon Oct 15 04:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.7311· OSTI ID:6057048

Maboudian, R; Postawa, Z; El-Maazawi, M; Garrison, B J; Winograd, N ^[1]

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1. Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802 (USA)

Energy-resolved angular distributions of Rh atoms desorbed by 5 keV Ar-ion bombardment of the Rh{l brace}100{r brace} surface are measured with use of a multiphoton resonance ionization technique. The results are shown to be in good agreement with molecular-dynamics simulations of the ion-impact event using the same interaction potential optimized previously to describe desorption from Rh{l brace}111{r brace}. In addition, by analyzing contour plots of the surface potential energy, the trend in the experimental results for Rh{l brace}100{r brace} and those previously published for Rh{l brace}111{r brace} are well explained. Based on this analysis, it is concluded that the peak in the polar-angle distribution of neutral particles desorbed from ion-bombarded single crystals is mainly determined by the relative positions of surface atoms which influence the trajectory of an exiting particle via channeling and blocking. Moreover, the anisotropy of the momentum imparted to the surface atoms in the last collision leads to an enhancement of ejection along certain crystallographic directions.

• OSTI ID: 6057048
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:12; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANGULAR DISTRIBUTION
ARGON IONS
CHARGED PARTICLES
COLLISIONS
CRYSTALS
DESORPTION
DISTRIBUTION
ELEMENTS
ENERGY RANGE
ION COLLISIONS
IONS
KEV RANGE
KEV RANGE 01-10
METALS
MONOCRYSTALS
PLATINUM METALS
RHODIUM
TRANSITION ELEMENTS