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Excitation and desorption of physisorbed H2 via the 2Σu electron scattering resonance.
Göteborgs Universitet.
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörsvetenskap och fysik. (Materialfysik)ORCID-id: 0000-0003-1711-5595
2017 (engelsk)Inngår i: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 147, s. 114703-1-114703-11, artikkel-id 114703Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Our high-resolution electron energy-loss measurements concern physisorbed H2 and comprise dif- ferential cross sections for the excitation of the internal H2 modes and the H2-surface bonding mode and their combinations and extend over the electron impact energy range of the classical low-energy H2 2Σu resonance. Comparison with corresponding data for the excitation of the internal modes of gas phase H2 reveals that strong elastic electron reflectivity from the Cu(100) substrate profoundly distorts the inelastic scattering pattern for physisorbed H2. We find that this influence can be corrected for and that the resulting peak cross sections agree with the H2 gas phase data, in accordance with theoretical predictions for the excitation of the internal H2 vibration. We have used corrected cross sections for the rotational mode spectra of physisorbed H2, HD, and D2 in a model concerning elec- tron induced desorption via rotation-translation energy conversion. These spectra include transitions from the ground state as well as excited levels of the physisorption potential well. H2 and HD can desorb from all levels while D2, for energetic reason, can only desorb from the excited levels. This model gives a satisfactory account of the observed desorption cross sections and predicts character- istic velocity distributions of the desorbing molecules. The cross section data for H2 and HD reveals that direct bound-free transitions also contribute to the electron induced desorption. 

sted, utgiver, år, opplag, sider
American Institute of Physics (AIP), 2017. Vol. 147, s. 114703-1-114703-11, artikkel-id 114703
Emneord [en]
Hydrogen molecules, Physisorption, electron scattering resonances, HREELS
HSV kategori
Forskningsprogram
Fysik
Identifikatorer
URN: urn:nbn:se:kau:diva-64425DOI: 10.1063/1.5003069OAI: oai:DiVA.org:kau-64425DiVA, id: diva2:1146069
Tilgjengelig fra: 2017-10-02 Laget: 2017-10-02 Sist oppdatert: 2017-11-21bibliografisk kontrollert

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