The dynamics of hydrogen adsorption on polycrystalline uranium |
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Authors: | SG Bazley TS Nunney C Mormiche BE Hayden |
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Institution: | School of Chemistry, University of Southampton, Southampton, Hampshire SO17 1BJ, UK |
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Abstract: | The dynamics of dissociative hydrogen adsorption on clean polycrystalline uranium has been studied using temperature programmed desorption and supersonic molecular beams. The initial sticking probability was measured as a function of incident kinetic energy between 3 and 255 meV. Two adsorption channels were observed; a non-activated direct channel was shown to be active over the entire energy range studied and a low energy indirect channel that was characterised by a decrease in sticking probability with increasing beam energy, and an insensitivity to both surface temperature and a range of hydrogen coverages. Together these results suggest the existence of an unaccommodated molecular precursor that has sufficient lifetime and mobility to locate favourable sites and dissociatively adsorb. |
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Keywords: | Hydrogen Uranium Adsorption Precursor |
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