ORIENTATION AND PERPENDICULAR ENERGY-DEPENDENCE OF DISSOCIATIVE SCATTERING OF HYDROGEN FROM CU(111)

Autor(en): RECHTIEN, JH
HARDER, R
HERRMANN, G
SNOWDON, KJ
Stichwörter: Chemistry; Chemistry, Physical; METAL-SURFACES; Physics; Physics, Condensed Matter
Erscheinungsdatum: 1992
Herausgeber: ELSEVIER SCIENCE BV
Journal: SURFACE SCIENCE
Volumen: 272
Ausgabe: 1-3
Startseite: 240
Seitenende: 246
Zusammenfassung: 
We report measurements of the final molecular axis orientation and kinetic energy released in the dissociative neutralization of 2.98 keV H-2+ incident at glancing angles to a Cu(111) surface. We observe two distinct structures which we correlate with scattering on two distinct regions of the potential energy hypersurface (PES) describing the interaction. The relative contribution of each of these structures to the total spectrum exhibits a threshold-like behaviour as a function of the perpendicular energy of the beam in the (nominal) range 1-2 eV. The perpendicular energy at which this threshold appears is dependent on the molecular axis orientation. We correlate this threshold with a barrier on the PES, and its dependence on orientation with an orientation dependent barrier height. The height variation is of order 0.9 eV, and the barrier is lowest for the surface-parallel axis orientation.
Beschreibung: 
INTERNATIONAL CONF ON MOLECULAR-SURFACE INTERACTIONS, JULICH, GERMANY, OCT 14-15, 1991
ISSN: 00396028
DOI: 10.1016/0039-6028(92)91445-H

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