Detection of rovibrationally excited H2 formed through the heterogeneous recombination of H atoms on a cold HOPG surface |
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| Authors: | JSA Perry SD Price |
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| Institution: | (1) Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK |
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| Abstract: | This paper reports results from an experiment designed to measure the nascent rovibrational population of H2 molecules that have formed through the heterogeneous recombination of H atoms on the surface of cosmic dust analogues under
conditions approaching those of the interstellar medium (ISM). H2 that has formed on a highly oriented pyrolytic graphite (HOPG) surface has been detected, using laser induced resonance-enhanced
multi-photon ionization (REMPI), in the v = 1 (J= 0–3) rovibrational states at surface temperatures of 30 K and 50 K. These excited product molecules display rotational temperatures
significantly higher than the target surface temperature. These first results suggest that a considerable proportion of the
binding energy released on formation of the H2 is deposited in the surface, in addition to internal excitation of the product molecules.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | astrochemistry dust molecular processes |
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