DIRECT MEASUREMENT OF THE ORIENTATION DEPENDENCE OF DISSOCIATIVE SCATTERING OF H2(+) FROM CU(111)

DC FieldValueLanguage
dc.contributor.authorRECHTIEN, JH
dc.contributor.authorHARDER, R
dc.contributor.authorHERRMANN, G
dc.contributor.authorROTHIG, C
dc.contributor.authorSNOWDON, KJ
dc.date.accessioned2021-12-23T16:03:24Z-
dc.date.available2021-12-23T16:03:24Z-
dc.date.issued1992
dc.identifier.issn00396028
dc.identifier.urihttps://osnascholar.ub.uni-osnabrueck.de/handle/unios/5974-
dc.description.abstractWe report a direct measurement of the molecular axis orientation dependence of dissociative neutralisation of 2.98 keV H-2+ at a Cu(111) surface. The kinetic energy epsilon-released and the final orientation theta of the molecular axis to the surface normal are derived from the measured laboratory-frame velocities of the neutral dissociation fragments. Above an incident beam perpendicular energy E perpendicular-to i almost-equal-to 3.5 eV the epsilon-energy distribution appears to consist of one structure peaking at or below epsilon almost-equal-to 0.75 eV. As we reduce E perpendicular-to i, an additional broad structure peaking at epsilon almost-equal-to 3 eV, theta almost-equal-to 60-degrees appears. The intensity ratio of these two structures remains approximately constant for E perpendicular-to i values below 1 eV. We propose that neutralisation occurs on the incident portion of the trajectory, primarily to the (surface modified) X1-SIGMA(g+) state of H-2, and furthermore, that the observed change of the spectrum with E perpendicular-to i may be related to reflection from (for E perpendicular-to i < 1 eV) and traversal over (for E perpendicular-to i > 1 eV) an activation barrier of height approximately 1 eV on the H-2/Cu potential energy surface.
dc.language.isoen
dc.publisherELSEVIER SCIENCE BV
dc.relation.ispartofSURFACE SCIENCE
dc.subjectADSORPTION
dc.subjectChemistry
dc.subjectChemistry, Physical
dc.subjectDESORPTION
dc.subjectENERGY
dc.subjectEXCITATION
dc.subjectH-2
dc.subjectHYDROGEN
dc.subjectMETAL-SURFACES
dc.subjectMOLECULES
dc.subjectPhysics
dc.subjectPhysics, Condensed Matter
dc.titleDIRECT MEASUREMENT OF THE ORIENTATION DEPENDENCE OF DISSOCIATIVE SCATTERING OF H2(+) FROM CU(111)
dc.typejournal article
dc.identifier.doi10.1016/0039-6028(92)91252-7
dc.identifier.isiISI:A1992HW92400035
dc.description.volume269
dc.description.issueA
dc.description.startpage213
dc.description.endpage218
dc.publisher.placePO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
dcterms.isPartOf.abbreviationSurf. Sci.
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