chemistry of metastable He I 2 ^3S (trac #276)

reported by: @CloudyLex

Title:  
Depopulation of Metastable Helium by Radiative Association with Hydrogen and Lithium Ions
Authors:    
Augustovi?ová, L.; Kraemer, W. P.; Soldán, P.
Affiliation:    
AA(Charles University in Prague, Faculty of Mathematics and Physics, Department of Chemical Physics and Optics, Ke Karlovu 3, CZ-12116 Prague 2, Czech Republic pavel.soldan@mff.cuni.cz), AB(Max-Planck Institute of Astrophysics, Postfach 1371, D-85741 Garching, Germany), AC(Charles University in Prague, Faculty of Mathematics and Physics, Department of Chemical Physics and Optics, Ke Karlovu 3, CZ-12116 Prague 2, Czech Republic)
Publication:    
The Astrophysical Journal, Volume 782, Issue 1, article id. 46, 7 pp. (2014). (ApJ Homepage)
Publication Date:   
02/2014
Origin: 
IOP
Astronomy Keywords: 
atomic data, atomic processes, molecular data, molecular processes
DOI:    
10.1088/0004-637X/782/1/46
Bibliographic Code: 
2014ApJ...782...46A
Abstract

Depopulation of metastable He(23S) by radiative association with hydrogen and lithium ions is investigated using a fully quantal approach. Rate coefficients for spontaneous and stimulated radiative association of the HeH+, HeD+, and LiHe+ molecular ions on the spin-triplet manifold are presented as functions of temperature considering the association to rotational-vibrational states of the lowest triplet electronic states a 3?+ and b 3?+ from the continuum states of the b 3?+ electronic state. Evaluation of the rate coefficients is based on highly accurate quantum calculations, taking into account all possible state-to-state transitions at thermal energies (for spontaneous association) or at higher background energies (stimulated association). As expected, calculations show that the rate coefficients for radiative association to the a state are several orders of magnitude larger than the one for the b state formation. A noticeable effect by blackbody background radiation on the radiative association is only obtained for the b ? b process. Aspects of the formation and abundance of the metastable HeH+(a 3?+) in astrophysical environments are briefly discussed.

Migrated from https://www.nublado.org/ticket/276

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    "status": "new",
    "changetime": "2019-02-04T13:07:06Z",
    "_ts": "1549285626580696",
    "description": "{{{\nTitle:\t\nDepopulation of Metastable Helium by Radiative Association with Hydrogen and Lithium Ions\nAuthors:\t\nAugustovi?ov\u00e1, L.; Kraemer, W. P.; Sold\u00e1n, P.\nAffiliation:\t\nAA(Charles University in Prague, Faculty of Mathematics and Physics, Department of Chemical Physics and Optics, Ke Karlovu 3, CZ-12116 Prague 2, Czech Republic pavel.soldan@mff.cuni.cz), AB(Max-Planck Institute of Astrophysics, Postfach 1371, D-85741 Garching, Germany), AC(Charles University in Prague, Faculty of Mathematics and Physics, Department of Chemical Physics and Optics, Ke Karlovu 3, CZ-12116 Prague 2, Czech Republic)\nPublication:\t\nThe Astrophysical Journal, Volume 782, Issue 1, article id. 46, 7 pp. (2014). (ApJ Homepage)\nPublication Date:\t\n02/2014\nOrigin:\t\nIOP\nAstronomy Keywords:\t\natomic data, atomic processes, molecular data, molecular processes\nDOI:\t\n10.1088/0004-637X/782/1/46\nBibliographic Code:\t\n2014ApJ...782...46A\nAbstract\n\nDepopulation of metastable He(23S) by radiative association with hydrogen and lithium ions is investigated using a fully quantal approach. Rate coefficients for spontaneous and stimulated radiative association of the HeH+, HeD+, and LiHe+ molecular ions on the spin-triplet manifold are presented as functions of temperature considering the association to rotational-vibrational states of the lowest triplet electronic states a 3?+ and b 3?+ from the continuum states of the b 3?+ electronic state. Evaluation of the rate coefficients is based on highly accurate quantum calculations, taking into account all possible state-to-state transitions at thermal energies (for spontaneous association) or at higher background energies (stimulated association). As expected, calculations show that the rate coefficients for radiative association to the a state are several orders of magnitude larger than the one for the b state formation. A noticeable effect by blackbody background radiation on the radiative association is only obtained for the b ? b process. Aspects of the formation and abundance of the metastable HeH+(a 3?+) in astrophysical environments are briefly discussed.\n}}}",
    "reporter": "gary",
    "cc": "",
    "resolution": "",
    "time": "2014-02-07T15:30:37Z",
    "component": "atomic/molecular data base",
    "summary": "chemistry of metastable He I 2 ^3S",
    "priority": "good to do",
    "keywords": "",
    "version": "trunk",
    "milestone": "no milestone",
    "owner": "nobody",
    "type": "enhancement"
}

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chemistry of metastable He I 2 ^3S (trac #276) #278