Alkali sensitization of H+ electron stimulated desorption from H adsorbed on Ni(111)

It is shown that alkali adatoms coadsorbed in the presence of adsorbed hydrogen on Ni(111) can cause a large increase in the cross section for H+ emission during electron stimulated desorption. This phenomenon was investigated using the digital ESDIAD (electron stimulated desorption ion angular dist...

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Bibliographic Details
Published in:The Journal of chemical physics 1988-07, Vol.89 (1), p.570-576
Main Authors: LANZILLOTTO, A.-M, DRESSER, M. J, ALVEY, M. D, YATES, J. T. JR
Format: Article
Language:English
Subjects:
Applied sciences
Chemistry
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
General and physical chemistry
Materials science
Metals, semimetals and alloys
Metals. Metallurgy
Physics
Solid-gas interface
Specific materials
Surface physical chemistry
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Summary:It is shown that alkali adatoms coadsorbed in the presence of adsorbed hydrogen on Ni(111) can cause a large increase in the cross section for H+ emission during electron stimulated desorption. This phenomenon was investigated using the digital ESDIAD (electron stimulated desorption ion angular distribution) technique as well as by temperature programmed desorption (TPD). H+ ions produced by electron impact on alkali–hydrogen complexes are ejected in sharp normally oriented ion angular distributions. The sensitization of the H(a)→e−H+ process occurs with Li, Na, and K but not as strongly with Rb and Cs. Attractive interactions exist in the adsorbed layer between the hydrogen and the alkali adatoms. A model is discussed involving the formation of ‘‘alkali–hydride-like’’ surface complexes, with Hδ− located on top of alkali atom sites.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.455447