Rotational corrugation in associative desorption of D2 from Cu(111)
Institut für Laser- und Plasmaphysik,
Universität Essen - 45117 Essen, Germany
2 Institut für Grenzflächenforschung und Vakuumphysik, Forschungszentrum Jülich, 52428 Jülich, FRG.
Accepted: 19 August 1996
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.
PACS: 33.20.Ni – Vacuum ultraviolet spectra / 79.20.Rf – Atomic, molecular, and ion beam interactions with surfaces / 82.65.-i – Surface and interface chemistry
© EDP Sciences, 1996