The adsorption of H2O on clean and oxygen precovered Ni(111) studied by ARUPS and TPD

Pache T, Steinrück HP, Huber W, Menzel D (1989)

Publication Type: Journal article, Original article

Publication year: 1989

Journal

Surface Science Elsevier

Original Authors: Pache T., Steinrück H.-P., Huber W., Menzel D.

Publisher: Elsevier

Book Volume: 224

Pages Range: 195-214

DOI: 10.1016/0039-6028(89)90910-2

Abstract

Using TPD, ARUPS, XPS, LEED and work function measurements the adsorption of water has been studied on the clean Ni(111) surface and on a Ni(111) surface precovered with 0.25 ML of oxygen. For the clean surface the saturation coverage of chemisorbed water is determined to 0.66 ML by XPS. The observed ( 3 × 3)R30° structure must then be non-primitive containing two molecules per unit cell. Angle resolved UPS spectra show a splitting of the 3a level indicating the existence of two nonequivalent molecules in the chemisorbed layer, both being tilted with respect to the surface normal. The so-called "bilayer" structure is proposed for this saturated chemisorbed layer. The TPD spectra show three distinct peaks at 171, 152 and 158 K that are attributed to desorption from the chemisorbed bilayer, a transition layer and condensed water, respectively. Upon oxygen preadsorption an additional peak is observed in TPD of water reaching from 180 to 260 K with a saturation coverage of 0.25 ML. This peak is attributed to intact HO molecules directly chemisorbed on the Ni(111) surface. The angle resolved UPS spectra show very distinct angular dependences of all molecular levels. No evidence for dissociation is found. The orientation of the molecules is proposed to be tilted perpendicular to the molecular plane possibly due to hydrogen bonding to two neighbouring oxygen atoms. © 1989.

Authors with CRIS profile

Hans-Peter Steinrück Lehrstuhl für Physikalische Chemie II

Involved external institutions

Technische Universität München (TUM) DE Germany (DE)

How to cite

APA:

Pache, T., Steinrück, H.-P., Huber, W., & Menzel, D. (1989). The adsorption of H2O on clean and oxygen precovered Ni(111) studied by ARUPS and TPD. Surface Science, 224, 195-214. https://doi.org/10.1016/0039-6028(89)90910-2

MLA:

Pache, T., et al. "The adsorption of H2O on clean and oxygen precovered Ni(111) studied by ARUPS and TPD." Surface Science 224 (1989): 195-214.

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