The radiative association of He+ and He and H(+) and H

Details The radiative association of He+ and He and H(+) and H The radiative association of He+ and He and H(+) and H

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414..672s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 2, p. 672-675.

Astronomy and Astrophysics

Astrophysics

22

Association Reactions, Helium Ions, Interstellar Chemistry, Molecular Ions, Cosmology, Hydrogen Ions, Planetary Nebulae, Supernova Remnants, Supernova 1987A

Scientific paper

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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