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Astrophysically important reactions involving excited hydrogen

RAWLINGS, JMC; DREW, JE; BARLOW, MJ; (1994) Astrophysically important reactions involving excited hydrogen. In: Nenner, I, (ed.) AIP Conference Proceedings. (pp. pp. 437-443). AIP Green open access

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Abstract

The associative ionization reaction H(n=2) + H → H+2 + e− is found to be a greater contributor to the H2 formation rate than the direct radiative association reaction H(n=2) + H → H2 + hν in most regions of astrophysical interest. The endothermicity (≂1.1 eV) of the reaction and the high departures from LTE that are required for the H I (n=2) level to be sufficiently populated restrict its significance to regions of high excitation. The reaction H(n=2) + H+ → H+2 + hν may be significant in highly excited ionized regions, such as planetary nebulae and shocks. Chemical models of circumstellar regions have been reassessed in the light of this information. A critical examination reveals tht excitation effects are, in general, very important in many astrophysical situations. Only exceptionally, will reactions involving the higher excited states (n≳2) be as significant as those involving H(n=2).

Type: Proceedings paper
Title: Astrophysically important reactions involving excited hydrogen
Event: Molecules and Grains in Space - 50th International Meeting of Physical Chemistry
Location: MONT SAINTE-ODILE, FRANCE
Dates: September 1993
ISBN: 1-56396-355-8
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.46568
Publisher version: https://doi.org/10.1063/1.46568
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Technology, Astronomy & Astrophysics, Physics, Atomic, Molecular & Chemical, Spectroscopy, Physics
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10096176
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