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• W2040710119 abstract "Abstract The coadsorption of H 2 O and alkalis (Li, Na and K) on a stepped Ni(s)(111) surface with nominal (775) orientation was studied by UPS (UV-light induced photoelectron spectroscopy), LEED, TDS (thermal desorption spectroscopy) and work function change measurements (Δ Φ ). On clean Ni(775) five H 2 O desorption states denoted as A ( T m =160 K), B (175 K), C (225 K), D (260 K) and E (340 K) were detected. The A and B states are also observed at similar desorption temperatures on flat Ni(111) and are therefore attributed to H 2 O adsorption on the (111) terraces of Ni(775) ( B state) or to the desorption of ice multilayers ( A state). Consequently, the C , D and E states are ascribed to the adsorption and a partial dissociation at step sites. The C state is associated with a “five peak” UPS spectrum interpreted as due to the overlap of the 1b 1 , 3a 1 and 1b 2 orbitals of molecular water and 2 σ and 1 π emission from OH groups. A preferred adsorption of the alkalis at step sites for low coverages is deduced from the Δ Φ changes. For Li adsorption the saturation of the step sites is accompanied by a significant change in the slope of the Δ Φ versus coverage curve. The increase of the effective dipole moment (less negative for low coverages, adsorption at step sites) is caused by screening of the positively charged alkalis in a step-down adsorption geometry. For the coadsorption of H 2 O and alkalis (at low alkali precoverages) only H 2 O desorption states C , D and E from step sites are influenced. The C state shifts to lower peak temperature, whereas the D and E states (recombination from dissociation products) decrease in intensity with increasing alkali coverage. Alkali coadsorption on Ni(775) is accompanied by the dissociation of water, depending on the nature and the precoverage of the alkali. The tendency to induce dissociation is highest for Li and decreases with increasing ionic radius from Na to K." @default.
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• W2040710119 date "1998-05-01" @default.
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• W2040710119 title "H2O adsorption on alkali (Li, Na and K) precovered Ni(775)" @default.
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• W2040710119 doi "https://doi.org/10.1016/s0039-6028(98)00061-2" @default.
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