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An apparatus to determine the rovibrational distribution of molecular hydrogen formed by the heterogeneous recombination of H atoms on cosmic dust analogues

Perry, JSA; Gingell, JM; Newson, KA; To, J; Watanabe, N; Price, SD; (2002) An apparatus to determine the rovibrational distribution of molecular hydrogen formed by the heterogeneous recombination of H atoms on cosmic dust analogues. MEAS SCI TECHNOL , 13 (9) 1414 - 1424.

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Abstract

An experiment has been constructed to determine the rovibrational states populated in the formation of H-2 on the surface of cosmic dust under conditions approaching those of the interstellar medium (ISM). During the experiment, a beam of atomic hydrogen of controlled temperature is incident upon a target which is an analogue of cosmic dust. Molecular hydrogen desorbing from the target's surface is ionized using (2 + 1) resonance enhanced multiphoton ionization and detected using time-of-flight mass spectrometry. The experiment allows the rovibrational populations of the H-2 molecules desorbing from the cosmic dust targets to be determined providing information on the energy budget of the H-2 formation process in the ISM. Preliminary results from the experiment, to prove its viability, show that H-2 molecules formed on an highly oriented pyrolytic graphite surface have a measurable population of excited vibrational and rotational states.

Type:Article
Title:An apparatus to determine the rovibrational distribution of molecular hydrogen formed by the heterogeneous recombination of H atoms on cosmic dust analogues
Keywords:REMPI, molecular hydrogen formation, interstellar medium, heterogeneous chemistry, graphite, atom-surface interaction, hydrogen atom, ELEY-RIDEAL MECHANISM, STATE-SPECIFIC DETECTION, 2-PHOTON EXCITATION, INTERSTELLAR DUST, GRAPHITE SURFACE, BEAM SOURCE, MULTIPHOTON IONIZATION, HIGH-INTENSITY, ICY MANTLES, H-2
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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