The Radiative Association of C and S, C + and S, Si and O, and Si + and O

Details The Radiative Association of C and S, C + and S, Si and O, and Si + and O The Radiative Association of C and S, C + and S, Si and O, and Si + and O

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...451..889a&link_type=abstract

Astrophysical Journal v.451, p.889

Astronomy and Astrophysics

Astronomy

20

Ism: Molecules, Molecular Processes

Scientific paper

Rate coefficients for radiative association of carbon and sulfur atoms to form CS, carbon ions and sulfur atoms to form CS+, silicon and oxygen atoms to form SiO, and silicon ions and oxygen atoms to form SiO+ are estimated for temperatures ranging from 300 to 14,700 K. For this temperature range, radiative association rate coefficients (k) are found to vary with temperature (T) as kcs = 4.36 × 10-19 TSUP>0.22±0.01 cm3 s-1 for CS, kcs+ = 3.07 × 10-19 T0.15±0.02 cm-1CS+, kSiO = 5.52 × 10-18 T0.31±0.02 cm3 s-1 for SiO, and kSiO+ = 6.22 × 10-18 -4.61 × 10-22 T + 2.73 × 10-26 T2 cm3 s-1 for SiO+. Our calculated rate coefficients kSiO are higher than the values used in modeling the chemistry of SN 1987A and molecular outflow regions. On the other hand, for Si+ and O, the rate coefficients are one order of magnitude lower than the values used in modeling the chemistry of circumstellar envelopes.

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