The Formation of CN and CN+ by Direct Radiative Association

Details The Formation of CN and CN+ by Direct Radiative Association The Formation of CN and CN+ by Direct Radiative Association

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...537..261s&link_type=abstract

The Astrophysical Journal, Volume 537, Issue 1, pp. 261-263.

Astronomy and Astrophysics

Astronomy

5

Atomic Processes, Ism: Molecules, Molecular Processes

Scientific paper

Rate coefficients for direct radiative association of carbon and nitrogen atoms to form CN, and of carbon ions and nitrogen atoms to form CN + ions, are calculated for temperatures in the range of 300 to 14,700 K. For the CN molecule, the rate coefficients can be represented by the standard expression, kCN(T)=7.87×10-19(T/300)0.056exp(- 96.0/T) cm3 s-1 for temperatures between 300 and 2700 K and kCN(T)=1.37×10-18(T/300)- 0.128exp(-520.1/T) cm-3 s-1 at T>2700 K. For the CN+ ion, the corresponding expression is kCN+(T)=1.08×10- 18(T/300)0.071exp(-57.5/T) cm-3 s-1 for the temperature range studied. Calculated rate coefficients kCN are about 2 orders of magnitude lower than the canonical value used in the modeling of the chemistry of various astrophysical environments.

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