Computer simulations of hyperchanneling of low energy ions in semichannelsof Pt(111)-(1 x 1) surface

Citation
Km. Lui et al., Computer simulations of hyperchanneling of low energy ions in semichannelsof Pt(111)-(1 x 1) surface, NUCL INST B, 182, 2001, pp. 200-206
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
ISSN journal
0168-583X → ACNP
Volume
182
Year of publication
2001
Pages
200 - 206
Database
ISI
SICI code
0168-583X(200108)182:<200:CSOHOL>2.0.ZU;2-T
Abstract
The scattering and recoiling imaging code (SARIC) was employed to perform c lassical ion trajectory simulations of hyperchanneling phenomenon of low en ergy noble gas ions on the Pt(111)-(1x1) surface. It was found that under p roper conditions, incident ions can indeed possess oscillatory trajectories within one single open semichannel in the first atomic layer of the Pt sur face, which confirmed the concept of hyperchanneling. This special scatteri ng phenomenon was explained by the fact that the smooth overlapping of atom ic potentials of the atoms lining the walls of the semichannel effectively provides a potential trap along the trajectories of the incident ions resul ting in the hyperchanneling. In addition, it was found that the mass of the ions had a profound effect on the conditions to achieve hyperchanneling. D etailed simulations revealed that hyperchanneled ions suffered very little energy loss and energy spread upon exiting the surface. Due to the ultrahig h sensitivity of hyperchanneling ions to minute corrugations of the potenti als of the atomic walls, hyperchanneling can be utilized to determine the s urface Debye temperature, which is one of the important parameters to model most surface reactions. (C) 2001 Elsevier Science B.V. All rights reserved .