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Proceedings Paper

Quantum state resolved studies on UV-laser-induced desorption of small molecules from single crystal oxide surfaces
Author(s): Ingrid Beauport; Katharina H.B. Al-Shamery
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Paper Abstract

The results of a fully quantum state resolved study of the laser-induced desorption of CO from an epitaxially grown film of Cr2O3(111)/Cr(110) at a surface temperature of 100 K are reported by using a (1+')REMPI (resonance enhanced multiphoton ionization) detection technique for the desorbing molecules via the B1(Sigma) +$IMPX1(Sigma) + electronic state. In order to get an insight into excitation mechanism the wavelength dependence of the desorption process was studied at 3.5 eV, 5.0 eV, and 6.4 eV. For all three wavelengths we observed nonthermal desorption. The final state distributions did not show any significant changes for the three wavelengths except for the overall intensities. The velocity flux distributions were bimodal for v"equals1. the desorption cross sections measured vary between (5+/- 1)(DOT)10-18 cm2 for 3.5 eV and (3.5+/- 1)(DOT)10-17 cm2 for 6.4 eV. The behavior indicates that the origin of the desorption has to be an indirect process via electronic excitation of the substrate. Possible mechanisms are discussed.

Paper Details

Date Published: 25 September 1995
PDF: 9 pages
Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); doi: 10.1117/12.221472
Show Author Affiliations
Ingrid Beauport, Ruhr-Univ. Bochum (Germany)
Katharina H.B. Al-Shamery, Ruhr-Univ. Bochum (Germany)

Published in SPIE Proceedings Vol. 2547:
Laser Techniques for Surface Science II
Janice M. Hicks; Wilson Ho; Hai-Lung Dai, Editor(s)

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