Adsorption of hydrogen on clean and potassium modified low index copper surfaces: Cu(100) and Cu(110)

The adsorption of atomic hydrogen has been studied on clean and potassium modified Cu(110) and Cu(100) surfaces. Two hydrogen induced states in the valence band have been found on the clean Cu(110) surface, an α state receding in the subsurface and a β state in the surface of the crystal. Upon annea...

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Bibliographic Details
Published in:Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films Surfaces, and Films, 2001-07, Vol.19 (4), p.1988-1992
Main Authors: Thomsen, L., Onsgaard, J., Godowski, P. J., Møller, P., Hoffmann, S. V.
Format: Article
Language:English
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Summary:The adsorption of atomic hydrogen has been studied on clean and potassium modified Cu(110) and Cu(100) surfaces. Two hydrogen induced states in the valence band have been found on the clean Cu(110) surface, an α state receding in the subsurface and a β state in the surface of the crystal. Upon annealing, hydrogen in the subsurface both diffuses to the surface and desorbs at 330 K, and diffuses into the bulk. Two states, α K and β K , have also been observed on the potassium modified surfaces, with the α K state assigned to a potassium-hydrogen bond and the β K state assigned to a Cu–hydrogen bond. The Cu(110) surface is significantly more reactive than the Cu(100) surface.
ISSN:0734-2101
1520-8559
DOI:10.1116/1.1359552