Enhanced creation of dispersive monolayer phonons in Xe/Pt(111) by inelastic helium atom scattering at low energies

Flemming Yssing Hansen, Ludwig Walter Bruch

Research output: Contribution to journalJournal articleResearchpeer-review

229 Downloads (Pure)

Abstract

Conditions likely to lead to enhanced inelastic atomic scattering that creates shear horizontal (SH) and longitudinal acoustic (LA) monolayer phonons are identified, specifically examining the inelastic scattering of He-4 atoms by a monolayer solid of Xe/Pt(111) at incident energies of 2-25 meV. There is strong inelastic scattering for both dispersive phonon branches (SH and LA) of the monolayer at incident energies below 8 meV. Several improvements enable more complete wave packet calculations of the inelastic scattering than in previous work. Long propagation times are made feasible by adding an absorbing potential at large distance. The times now extend to beyond 100 ps and enable a clarification of processes involving transient trapping of the He atoms. The wave packet is made more monochromatic by significantly increasing the spatial width of the initial Gaussian shape. The narrower energy distribution in the incident beam then enables a demonstration of strong energy dependence of the scattering over a scale of less than 0.3 meV. (c) 2007 American Institute of Physics.
Original languageEnglish
JournalJournal of Chemical Physics
Volume127
Issue number20
Pages (from-to)204708
ISSN0021-9606
DOIs
Publication statusPublished - 2007

Bibliographical note

Copyright (2007) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

Keywords

  • HE ATOMS
  • CU(111)
  • ELASTIC-SCATTERING
  • XE OVERLAYERS
  • DYNAMICS
  • PT(111) SURFACE
  • VIBRATIONS
  • XENON
  • GRAPHITE
  • ADSORPTION RESONANCES

Cite this