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Electron-stimulated desorption of D (H) from condensed D2O (H2O) films |
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| Authors: | W C Simpson L Parenteau R S Smith L Sanche T M Orlando |
| Institution: | a Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, P.O. Box 999, M/S K8-88, Richland, WA 99352, USA b Canadian Medical Research Group in Radiation Sciences, Faculty of Medicine, University of Sherbrooke, Sherbrooke, Que., J1H 5N4, Canada |
| Abstract: | The electron-stimulated desorption (ESD) of D− and H− ions from condensed D2O and H2O films is investigated. Three low-energy peaks are observed in the ESD anion yield, which are identified as arising from excitation of 2B1, 2A1 and 2B2 dissociative electron attachment (DEA) resonances. Additional structure is observed between 18 and 32 eV, which may be due to ion pair formation or to DEA resonances involving the 2a1 orbital. The ion yield resulting from excitation of the 2B1 resonance increases as the film is heated. We attribute the increase in the ion yield to thermally induced hydrogen bond breaking near the surface, which enhances the lifetimes of the excited states that lead to desorption. |
| Keywords: | Amorphous thin films Desorption induced by electronic transitions (DIET) Electron-stimulated desorption (ESD) Polycrystalline thin films Water |
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