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The dynamics of hydrogen adsorption on polycrystalline uranium

The dynamics of hydrogen adsorption on polycrystalline uranium
The dynamics of hydrogen adsorption on polycrystalline uranium
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.

hydrogen, uranium, adsorption, precursor
0169-4332
6376-6379
Bazley, S.G.
5da56e17-b9dd-4ab5-ace1-62ff3982896a
Nunney, T.S.
d938cca8-dd83-40bd-8ca3-a26269fac2e5
Mormiche, C.
00a2dfb0-7160-453a-9eb1-02808eb60cb4
Hayden, B.E.
aea74f68-2264-4487-9d84-5b12ddbbb331
Bazley, S.G.
5da56e17-b9dd-4ab5-ace1-62ff3982896a
Nunney, T.S.
d938cca8-dd83-40bd-8ca3-a26269fac2e5
Mormiche, C.
00a2dfb0-7160-453a-9eb1-02808eb60cb4
Hayden, B.E.
aea74f68-2264-4487-9d84-5b12ddbbb331

Bazley, S.G., Nunney, T.S., Mormiche, C. and Hayden, B.E. (2008) The dynamics of hydrogen adsorption on polycrystalline uranium. Applied Surface Science, 254 (20), 6376-6379. (doi:10.1016/j.apsusc.2008.03.177).

Record type: Article

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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More information

Published date: 4 April 2008
Keywords: hydrogen, uranium, adsorption, precursor

Identifiers

Local EPrints ID: 159681
URI: https://eprints.soton.ac.uk/id/eprint/159681
ISSN: 0169-4332
PURE UUID: a03f48c8-7489-4c02-86e0-bd40a99554b8
ORCID for B.E. Hayden: ORCID iD orcid.org/0000-0002-7762-1812

Catalogue record

Date deposited: 05 Jul 2010 15:22
Last modified: 05 Nov 2019 02:08

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