A COMPARATIVE-STUDY OF THE DISSOCIATION DYNAMICS OF ENERGETIC H2, N2 AND NO SCATTERED FROM CU(111) UNDER GLANCING ANGLES OF INCIDENCE

Autor(en): NESBITT, A
HARDER, R
GOLICHOWSKI, A
HERRMANN, G
SNOWDON, KJ
Stichwörter: ADSORPTION; Chemistry; Chemistry, Physical; DESORPTION; N-2(+); Physics; Physics, Condensed Matter; SURFACE
Erscheinungsdatum: 1994
Herausgeber: ELSEVIER SCIENCE BV
Journal: SURFACE SCIENCE
Volumen: 307
Ausgabe: A
Startseite: 147
Seitenende: 152
Zusammenfassung: 
We have scattered fast beams of H-2, N2 and NO and their positive ions from Cu(111) under glancing angles of incidence. By directly measuring the relative velocity v of the dissociation fragments of those molecules which dissociatively scatter, we obtain distributions of the kinetic energy released in the H-H, N-N and N-0 internuclear coordinate as a function of the final orientation of the internuclear axis. We propose a dissociation mechanism involving repeated electronic excitation-relaxation cycles with the dynamics dominated in the case of H-2 by the topography of electronically excited states, and in the case of N2 and NO by vibrational excitation in the exit channel of the ground state. This interpretation is supported by classical dynamics simulations.
Beschreibung: 
13th European Conference on Surface Science (ECOSS-13), UNIV WARWICK, ARTS CTR, WARWICK, ENGLAND, AUG 30-SEP 04, 1993
ISSN: 00396028
DOI: 10.1016/0039-6028(94)90385-9

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