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Proceedings Paper

State and spatially resolved studies of UV-laser-induced desorption of molecules from oxide surfaces
Author(s): Katharina H.B. Al-Shamery; M. Menges; Ingrid Beauport; B. Baumeister; Thorsten Kluener; T. Mull; Hans-Joachim Freund; C. Fischer; P. Andresen; J. Freitag; Volker Staemmler
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Paper Abstract

Quantum state resolved velocity distributions of NO desorbing from single crystal metal and oxide surfaces after a non-thermal excitation process with UV-photons have been studied by several groups in the past. In order to achieve a 'complete' experiment it is necessary to determine in addition the spatial distribution of the desorbing particles. We report on results of the determination of angular distributions of desorbing NO via a new experimental setup. Two systems have been studied in detail, i.e. NO on NiO(100 and NO on NiO(111). A model proposed before is employed to explain the experimental results, i.e. the observation of bimodal velocity flux distributions. The bimodal signal is consistent with the existence of two desorption channels which are predicted to exhibit different angular distributions. This prediction is verified with the new experimental setup. The comparison of the two crystallographic planes of NiO allows us to address the problem of the influence of the magnetic properties of the substrate onto the population of different spin states of desorbing NO molecules. Finally we shall report on results gained with a CO detection system based on a (1+1') REMPI process employing VUV photons. Here the system CO/Cr2O3(111) is studied. With this setup the resolution of rotational states in the desorbing particles is easy to achieve in contrast to the widely used (2+1) REMPI process of the same transition.

Paper Details

Date Published: 21 July 1994
PDF: 10 pages
Proc. SPIE 2125, Laser Techniques for Surface Science, (21 July 1994); doi: 10.1117/12.180846
Show Author Affiliations
Katharina H.B. Al-Shamery, Univ. of Bochum (Germany)
M. Menges, Univ. of Bochum (Germany)
Ingrid Beauport, Univ. of Bochum (Germany)
B. Baumeister, Univ. of Bochum (Germany)
Thorsten Kluener, Univ. of Bochum (Germany)
T. Mull, Univ. of Bochum (Germany)
Hans-Joachim Freund, Univ. of Bochum (Germany)
C. Fischer, Max-Planck-Institut fuer Stroemungsforschung (Germany)
P. Andresen, Univ. of Bielefeld (Germany)
J. Freitag, Univ. of Bochum (Germany)
Volker Staemmler, Univ. of Bochum (Germany)

Published in SPIE Proceedings Vol. 2125:
Laser Techniques for Surface Science
Hai-Lung Dai; Steven J. Sibener, Editor(s)

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