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Cross sections and NO product state distributions resulting from substrate mediated photodissociation of NO2 adsorbed on Pd(111)

J. Chem. Phys. 92, 3154 (1990); doi:10.1063/1.457913

Issue Date: 1 March 1990

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E. Hasselbrink, S. Jakubith, S. Nettesheim, M. Wolf, A. Cassuto, and G. Ertl
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D1000 Berlin 33, West Germany
Ultraviolet irradiation of NO2 adsorbed on top of a NO saturated Pd(111) surface causes the photodissociation of NO2/N2O4 and results in the desorption of NO molecules. This process has been studied using excitation energies between 3.5 and 6.4 eV. At a photon energy of 6.4 eV, a cross section of 3×10−18 cm2 is found. Using laser-induced fluorescence to detect the desorbed NO molecules, fully state-resolved data detailing the energy channeling into different degrees of freedom has been obtained. Two desorption channels are found, one characterized by nonthermal state populations, and one showing accommodation to the surface. The yield of the fast channel shows a marked increase above 4 eV photon energy. The slow channel is interpreted as being due to NO molecules which, after formation, undergo a trapping–desorption process. A polarization experiment indicates that the photodissociation is initiated by excitation of metal electrons rather than direct absorption by the adsorbate. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 2 August 1989; accepted 14 November 1989
Permalink: http://link.aip.org/link/?JCPSA6/92/3154/1
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KEYWORDS and PACS

Keywords
PACS
  • 82.50.Fv
    Physical chemistry Photochemistry and radiation chemistry Photolysis, photodissociation, and photoionization by infrared, visible, and ultraviolet radiation
  • 82.65.My
    Physical chemistry Surface and interface chemistry Chemisorption
  • 82.20.Rp
    Physical chemistry Chemical kinetics Energy distribution and transfer; relaxation
  • YEAR: 1990

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
AIP is a member of CrossRef AIP

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