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

Abstract

view Abstract Citations (48) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Radiative Association of He + and He and H + and H Stancil, P. C. ; Babb, J. F. ; Dalgarno, A. Abstract 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. Publication: The Astrophysical Journal Pub Date: September 1993 DOI: 10.1086/173113 Bibcode: 1993ApJ...414..672S Keywords: Association Reactions; Helium Ions; Interstellar Chemistry; Molecular Ions; Cosmology; Hydrogen Ions; Planetary Nebulae; Supernova Remnants; Supernova 1987a; Atomic and Molecular Physics full text sources ADS | data products SIMBAD (2)