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Title:
The formation and destruction of HeH/+/ in astrophysical plasmas
Authors:
Roberge, W.; Dalgarno, A.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA)
Publication:
Astrophysical Journal, Part 1, vol. 255, Apr. 15, 1982, p. 489-496. (ApJ Homepage)
Publication Date:
04/1982
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Cosmic Plasma, Helium Ions, Hydrogen Ions, Molecular Clouds, Planetary Nebulae, Abundance, Association Reactions, Dense Plasmas, Emission Spectra, Extreme Ultraviolet Radiation, Hydrogen Clouds, Ionization, Molecular Excitation, Molecular Interactions, Molecular Ions, Photodissociation, Recombination Reactions, X Rays
Comment:
A&AA ID. AAA031.131.060
DOI:
10.1086/159849
Bibliographic Code:
1982ApJ...255..489R

Abstract

A discussion is presented of the formation and destruction mechanisms of the molecular ion HeH(+) in astrophysical plasmas. Calculations are made of the steady state abundance of HeH(+) in planetary nebulae and in dense clouds subjected to X-ray and XUV ionization. The excitation processes are investigated, and estimates are made of the emission-line intensities at 149.13, 3.364, and 3.607 microns. Emission at 149.13 microns from H II blisters and at 3.364 microns from high density planetary nebulae may be detectable.

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