Photoemission from sodium on ice: a mechanism for positive and negative charge coexistence in the mesosphere |
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| Authors: | Vondrak Tomas Plane John M C Meech Stephen R |
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| Affiliation: | School of Environmental Sciences and School of Chemical Sciences and Pharmacy, University of East Anglia, Norwich NR4 7TJ, UK. |
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| Abstract: | Photoemission from sodium deposited on ice films is described. Deposition of 0.02 ML of sodium is found to dramatically reduce the threshold for photoemission from the ice film to (2.3+/-0.2) eV. Thus, the cross-section for photoemission reaches >10(-18) cm2 in the visible region of the spectrum. It is proposed that the initial state is a solvated electron on the ice surface, which is supported by optical transmission spectroscopy. The potential significance of these results in understanding unexplained charging phenomena in the mesosphere is discussed. |
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