Title: State-selective energy and angular resolved detection of neutral species ejected from keV ion bombarded C6H6/Ag{111}
Authors: Vandeweert, Erno ×
Meserole, CA
Sostarecz, A
Dou, Y
Winograd, N
Postawa, Z #
Issue Date: Apr-2000
Series Title: Nuclear instruments and methods in physics research Section B: Interactions with materials and atoms vol:164 pages:820-826
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. (C) 2000 Elsevier Science B.V. All rights reserved
ISSN: 0168-583X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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