The radiative association of SI and N atoms, C and O atoms, and C atoms and S^+ ions

Details The radiative association of SI and N atoms, C and O atoms, and C atoms and S^+ ions The radiative association of SI and N atoms, C and O atoms, and C atoms and S^+ ions

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.303..235s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 303, Issue 2, pp. 235-238.

Astronomy and Astrophysics

Astronomy

7

Molecular Processes, Stars: Atmospheres, Novae, Cataclysmic Variables, Supernovae: General, Supernovae: Individual: Sn 1987A, Ism: Clouds

Scientific paper

Potential energy curves for the SiN.X^2Sigma^+ and A^2Pi_i electronic states, and the SiN(A^2Pi_i-X^2Sigma^+) transition moment function (TMF) are obtained at the MRCI level of theory, with a SA-CASSCF zero-order wavefunction. These potential energy curves and TMF are used to compute radiative association rate coefficients of Si and N atoms for temperatures in the range 300-14 700 K. Rate coefficients for radiative association of carbon and oxygen atoms for the formation of CO, and carbon atoms and sulphur ions for the formation of CS^+, are also calculated for temperatures in the range 300-14 700 K. These radiative association rate coefficients (k) are fitted to the standard equation, where A=2.02x10^-19 cm^3 s^-1, alpha=0.029 and beta=83.9 for the SiN molecule. The corresponding values for the CO molecule are 3.09x10^-17 cm^3 s^-1, 0.325 and 1629, and those for the CS^+ ion are 2.01x10^-18 cm^3 s^-1, 0.066 and 300.9. Radiative association of C and O atoms occurs with emissions of the first overtone band at 2.3 μm and the fundamental band at 4.6 μm found in the ejecta of Supernova 1987A and novae.

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