Europhys. Lett, 36 (1), pp. 31-36 (1996)
Rotational corrugation in associative desorption of from Cu(111)
D. Wetzig , M. Rutkowski , R. David and H. Zacharias
Institut für Laser- und Plasmaphysik,
Universität Essen - 45117 Essen, Germany
Institut für Grenzflächenforschung und Vakuumphysik, Forschungszentrum Jülich, 52428 Jülich, FRG.
(received 1 July 1996; accepted 19 August 1996)
PACS. 33.20Ni - Vacuum ultraviolet spectra.
PACS. 79.20Rf - Atomic, molecular, and ion beam interactions with surfaces.
PACS. 82.65-i - Surface and interface chemistry.
Abstract:We report rotationally state-resolved measurements of the average steric orientation of molecules desorbing from a Cu(111) surface. The desorbing flux of molecules is probed by laser-induced fluorescence with linearly polarized tunable vacuum ultraviolet radiation in the . Molecules desorbing in the vibrational ground state show for all rotational states measured a quadrupole alignment factor, , compatible with a spatially isotropic distribution. A strong azimuthal, polar, and lateral corrugation of the dissociative interaction potential can cause this behavior.
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