Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....85..144b&link_type=abstract
Astronomy and Astrophysics, vol. 85, no. 1-2, May 1980, p. 144, 145.
Astronomy and Astrophysics
Astrophysics
28
Carbon, Charge Transfer, Chemical Reactions, Nebulae, Sulfur, Hydrogen Clouds, Molecular Collisions, Positive Ions, Reaction Kinetics
Scientific paper
The rate coefficient for the charge transfer reaction C+(2P0) + H yields C(3P) + H(+) is calculated. At low energy, the reaction probably proceeds most rapidly by a weak spin orbit coupling of the 3Sigma(-) and 3Sigma(+) molecular states of CH(+) and it can be adequately treated using the distorted wave approximation. The derived rate coefficient at a temperature of 10,000 K is 1.4 x 10 to the -17th cu cm/s. An estimate of the rate coefficient for the reaction S+(4S0) + H yields S(3P) + H(+) is made; the reaction can proceed by a mechanism similar to the C(+)-H process. By scaling the carbon result, an approximate upper limit of 3 x 10 to the -15th cu cm/s is obtained for the rate coefficient at 10,000 K achievable only if the SH(+) potential energy curves are favorably located. The results differ by orders of magnitude from the empirical rate coefficients derived from a study of the neutral carbon and sulfur observed in diffuse nebulae.
Butler S. E.
Dalgarno Alexander
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