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The radiative association of He+ and He and H(+) and H
Stancil, P. C.; Babb, J. F.; Dalgarno, A.
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 2, p. 672-675. (ApJ Homepage)
Publication Date:
Atomic and Molecular Physics
NASA/STI Keywords:
Association Reactions, Helium Ions, Interstellar Chemistry, Molecular Ions, Cosmology, Hydrogen Ions, Planetary Nebulae, Supernova Remnants, Supernova 1987a
Bibliographic Code:


The rate coefficient for the radiative association of He+ and He to form He(2+) is determined for temperatures T between 20 K and 500,000 K. It can be represented by a given relation to within 25 percent applicable up to 50,000 K. It is about an order of magnitude less than the rate coefficient for the radiative association of H(+) and H to form H(2+). Cross sections for the He(2+) and H(2+) reactions calculated using a fully quantum-mechanical method reveal weak resonance features at low energies. Implications of the He(+) + He radiative association process are discussed briefly in connection with the chemistry of supernova ejecta, planetary nebulae, and the early universe.

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