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Photoelectric emission from the alkali metal doped vacuum-ice interface

Vondrak, T., Meech, S.R. and Plane, J.M.C. (2009) Photoelectric emission from the alkali metal doped vacuum-ice interface. The Journal of Chemical Physics, 130 (5). 054702. ISSN 0021-9606

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The photoelectron photoemission spectra and thresholds for low coverages of Li and K adsorbed on water-ice have been measured, compared with photoionization spectra of the gas-phase atoms, and modeled by quantum chemical calculations. For both alkali metals the threshold for photoemission is dramatically decreased and the cross section increased on adsorption to the water-ice surface. Quantum chemical calculations suggest that the initial state is formed by the metal atoms adsorbed into the water-ice surface, forming a state with a delocalized electron distribution. This state is metastable and decays on the hundreds of seconds time scale at 92 K. The decay is markedly faster for Li than for K, probably due to diffusion into the ice film.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 American Institute of Physics. This is an author produced version of a paper published in The Journal of Chemical Physics. Uploaded in accordance with the publisher's self archiving policy.
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Chemistry (Leeds)
Depositing User: Sherpa Assistant
Date Deposited: 12 Mar 2009 14:25
Last Modified: 08 Feb 2013 17:06
Published Version: http://dx.doi.org/10.1063/1.3063658
Status: Published
Publisher: American Institute of Physics
Refereed: Yes
Identification Number: 10.1063/1.3063658
URI: http://eprints.whiterose.ac.uk/id/eprint/7972

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