Adsorption site determination of light elements on heavy substrates by low-energy ion channeling

Citation
Km. Lui et al., Adsorption site determination of light elements on heavy substrates by low-energy ion channeling, J APPL PHYS, 86(9), 1999, pp. 5256-5262
Citations number
46
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF APPLIED PHYSICS
ISSN journal
0021-8979 → ACNP
Volume
86
Issue
9
Year of publication
1999
Pages
5256 - 5262
Database
ISI
SICI code
0021-8979(19991101)86:9<5256:ASDOLE>2.0.ZU;2-8
Abstract
Ion channeling in the low-keV energy range is demonstrated by means of the technique of time-of-flight scattering and recoiling spectrometry. The pred ictions of the Lindhard string model of ion channeling are compared with th e experimental findings. Qualitative agreement was obtained between the exp erimentally measured critical angles and the predictions of the model. The technique of low-energy ion channeling is shown to be capable of quantitati vely probing the positions of light elements on heavy substrates with analy sis by simple geometrical constructs. Classical ion trajectory simulations using the scattering and recoiling imaging code were used to observe the de tails of the ion trajectories. Quantitative analysis of the Pt(111)-(1x1)-H surface using 5 keV Ne+ shows that the hydrogen atoms preferentially popul ate the threefold fcc sites with a height of 0.9 +/- 0.1 Angstrom above the first-layer Pt atoms and a corresponding Pt-H bond length of 1.9 +/- 0.1 A ngstrom. (C) 1999 American Institute of Physics. [S0021-8979(99)03321-6].