Effects of quantum mechanical tunneling on rates of radiative association

Details Effects of quantum mechanical tunneling on rates of radiative association Effects of quantum mechanical tunneling on rates of radiative association

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..282s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 1, 1989, p. 282-288.

Astronomy and Astrophysics

Astrophysics

25

Hydrocarbons, Interstellar Chemistry, Molecular Clouds, Nuclear Astrophysics, Quantum Mechanics, Electron States, Electron Transitions, Molecular Rotation, Transition Probabilities

Scientific paper

Radiative association in ion-molecular collisions plays an important role in the synthesis of polyatomic species in interstellar clouds. Here, the results of calculations on the radiative association reactions C(+) + H2 - CH2(+) + h(nu) and CH3(+) + H2 - CH5(+) + h(nu) are presented. While these calculations are based on the treatment of collisionally stabilized associations of neutral free radicals originally proposed by Troe, the effects of quantum mechanical tunneling through the centrifugal barriers on the effective potentials are included in the calculations for the first time. At 10 K, the inclusion of tunneling is estimated to increase the rates of association by factors of 2.2 for C(+) + H2 and by 2.0 for CH3(+) + H2.

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