Opened 4 years ago

#276 new enhancement

chemistry of metastable He I 2 ^3S

Reported by: Gary J. Ferland Owned by: nobody
Priority: good to do Milestone:
Component: atomic/molecular data base Version: trunk
Keywords: Cc:

Description

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.

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