Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...444..694l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 444, no. 2, p. 694-701
Astronomy and Astrophysics
Astrophysics
23
Capture Effect, Chemical Reactions, Interstellar Gas, Molecular Clouds, Neutral Particles, Anisotropy, Hamiltonian Functions, Statistical Analysis, Temperature Dependence, Temperature Gradients
Scientific paper
We have used long-range capture theories with a range of anisotropic potentials to calculate the rate coefficients for the neutral reactions C + C2H2 and CN + C2H2 as functions of temperature in the range 10-300 K. Both reactions are of probable importance in the gas-phase chemistry of dense interstellar clouds. The C + C2H2 reaction has been studied in the laboratory at room temperature, while the CN + C2H2 reaction has been studied in the laboratory at temperatures as low as 25 K. Our results are only in partial agreement with the measured values indicating (1) that short-range and/or statistical effects must in general be taken into account and (2) that the long-range theories are likely to be most accurate at low temperatures.
Herbst Eric
Liao Qing
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