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Formation of CO+ by radiative association II

Journal article
Authors M Zamecnikova
Magnus Gustafsson
Gunnar Nyman
P Soldan
Published in Monthly notices of the Royal Astronomical Society
Volume 492
Issue 3
Pages 3794–3802
ISSN 0035-8711
Publication year 2020
Published at Department of Chemistry and Molecular Biology
Pages 3794–3802
Language en
Keywords astrochemistry, molecular processes, radiation mechanisms: general, supernovae: general, ISM: molecules
Subject categories Biochemistry and Molecular Biology, Chemical Sciences


Radiative association of an oxygen atom with a carbon cation is investigated using quantal and semiclassical methods. The total rate coefficient for spontaneous radiative association of O(2s22p4, 3P) with C+(2s22p, 2P) on the doublet manifold is determined from the corresponding cross-sections. The cross-sections for the 12Σ−→A2Π⁠, 22Σ−→A2Π⁠, and C2Δ→A2Π continuum-bound processes are calculated either semiclassically, in combination with the Breit–Wigner approach, or fully quantum mechanically. In the temperature range 10–10 000 K, our recommended total rate coefficient, obtained from these calculations and the data of Zámečníková et al. (2019), slowly increases from 7.5 × 10−18 cm3s−1 to 2.1 × 10−17 cm3s−1. Corresponding aspects of the CO+ and CO formations in SN 1987A are discussed.

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