A photoelectron spectroscopic investigation of the interaction between H2O and oxygen on Ag(110) |
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| Authors: | MA Barteau RJ Madix |
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| Institution: | Department of Chemical Engineering, Stanford University, Stanford, California 94305, USA |
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| Abstract: | The adsorption and reaction of H2O with adsorbed oxygen atoms on Ag(110) was examined by UPS. In agreement with previous EELS results, H2O formed multilayers of ice upon adsorption at 140 K. The ice layers could be easily distinguished from monolayer coverages of chemisorbed H2O (present above 160 K) by UPS. The ice layers produced (1) strong attenuation of the emission from the Ag d-bands, (2) a nearly 2 eV shift of H2O valence levels to higher binding energy and (3) strong attenuation of emission from the H2O 3a1 orbital. H2O was observed to react stoichiometrically with O(a) above 250 K to produce a pure layer of adsorbed hydroxyl species. The UPS spectra for these species exhibited features at ?5.8 and ?8.7 eV, as well as strong features above the d-bands. These spectra were compared with those for OH(a) on other surfaces, and the difficulties of identifying OH by UPS due to contamination by excess H2O are discussed. |
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