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Journal of Chemical Physics / Volume 106 / Issue 6

J. Chem. Phys. 106, 2477 (1997); doi:10.1063/1.473155 (15 pages)

O2 transient trapping-desorption at the Ag(111) surface

Age Raukema, David A. Butler, and Aart W. Kleyn

FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands

(Received 17 May 1996; accepted 30 October 1996)

Molecular beam scattering experiments of O2 from Ag(111) carried out at a surface temperature of 150 K, which is below the desorption temperature for the molecular chemisorption state, show three different scattering paths: physisorption followed by desorption, direct-inelastic scattering and transient trapping-desorption. The transient trapping-desorption process is attributed to transient adsorption of the molecule in a metastable O2δ− state at the surface. The translational desorption energy of the transiently trapped molecules is far above thermal, strongly dependent on the surface temperature and independent of the translational energy and angle of the incident oxygen molecule. A strongly peaked intensity distribution around the surface normal is observed for the desorption. The transient trapping probability shows a sharp increase above a threshold energy and a subsequent decrease with increasing incidence energy. It is accompanied by a strong broadening in the angular direct-inelastically scattered flux distribution. The possible origin of the metastable O2δ− state will be discussed. © 1997 American Institute of Physics.

© 1997 American Institute of Physics

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KEYWORDS and PACS

Keywords

oxygen, desorption, molecule-surface impact, metastable states, silver

PACS

  • 68.03.Fg

    Evaporation and condensation of liquids

  • 68.43.Mn

    Adsorption kinetics

  • 68.43.-h

    Chemisorption/physisorption: adsorbates on surfaces

  • 79.20.Rf

    Atomic, molecular, and ion beam impact and interactions with surfaces

ARTICLE DATA

Permalink
http://link.aip.org/link/doi/10.1063/1.473155

PUBLICATION DATA

ISSN:

0021-9606 (print)  
1089-7690 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

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