Do large rate coefficients for ion-polar neutral reactions have a serious effect on chemical models of dense clouds?

Details Do large rate coefficients for ion-polar neutral reactions have a serious effect on chemical models of dense clouds? Do large rate coefficients for ion-polar neutral reactions have a serious effect on chemical models of dense clouds?

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986inpr.conf..151h&link_type=abstract

In NASA. Ames Research Center Summer School on Interstellar Processes: Abstracts of Contributed Papers p 151-152 (SEE N87-15043

Computer Science

Interstellar Matter, Molecular Clouds, Neutral Gases, Reaction Kinetics, Interstellar Chemistry, Langevin Formula, Polarization (Charge Separation), Stellar Evolution, Vapor Phases

Scientific paper

In order to incorporate large ion-polar neutral rate coefficients into existing gas phase reaction networks, it is necessary to utilize simplified theoretical treatments because of the significant number of rate coefficients needed. The authors have used two simple theoretical treatments: the locked dipole approach of Moran and Hamill for linear polar neutrals and the trajectory scaling approach of Su and Chesnavich for nonlinear polar neutrals. The former approach is suitable for linear species because in the interstellar medium these are rotationally relaxed to a large extent and the incoming charged reactants can lock their dipoles into the lowest energy configuration. The latter approach is a better approximation for nonlinear neutral species, in which rotational relaxation is normally less severe and the incoming charged reactants are not as effective at locking the dipoles. The treatments are in reasonable agreement with more detailed long range theories and predict an inverse square root dependence on kinetic temperature for the rate coefficient. Compared with the locked dipole method, the trajectory scaling approach results in rate coefficients smaller by a factor of approximately 2.5.

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