State-selective energy and angular resolved detection of neutral species ejected from keV ion bombarded C6H6/Ag{1 1 1}

E. Vandeweert, C. A. Meserole, A. Sostarecz, Y. Dou, N. Winograd, Z. Postawa

Research output: Contribution to journalConference article

12 Scopus citations

Abstract

We investigated the desorption of neutral benzene (C6H6) molecules and silver atoms from C6H6/Ag{1 1 1} upon bombardment by 8 keV Ar+ ions. Using state-selective resonant ionization spectroscopy, substrate atoms sputtered in the ground and a high-lying metastable state, and ground-state and vibrationally excited molecules could be probed separately. The silver atom yield, kinetic energy and polar angle distributions were found to be modified upon benzene dosing. From these results, it was inferred that a large fraction of the metastable silver atoms de-excite during collisions with adsorbates. Also the ejection of benzene molecules depends strongly both on the internal energy of the molecules and the degree of coverage of the Ag surface. Up to monolayer thickness, the benzene molecules are mainly ejected during collisions with departing substrate particles. Molecules with higher internal energy leave the surface with a distribution shifted towards higher kinetic energies. At multi-layer coverages, a slow desorption mechanism becomes dominant. It is suggested that only benzene molecules vibrationally excited near the benzene-vacuum interface can survive the ejection process without de-excitation.

Original languageEnglish (US)
Pages (from-to)820-826
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume164
DOIs
StatePublished - Apr 2000
EventICACS-18: 18th International Conference on Atomic Collisions in Solids - Odense, Denmark
Duration: Aug 3 1999Aug 8 1999

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

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