A synthesis of interstellar C4S

Details A synthesis of interstellar C4S A synthesis of interstellar C4S

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.235..493w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 235, Nov. 15, 1988, p. 493-496. NSERC-supported researc

Astronomy and Astrophysics

Astronomy

11

Interstellar Gas, Molecular Clouds, Organic Sulfur Compounds, Sulfur, Abundance, Electron Recombination, Free Radicals, Hydrocarbons, Molecular Ions, Oxygen Atoms, Time Dependence

Scientific paper

The reaction between S+ and C4H2 (diacetylene) has been studied in a SIFT apparatus at 294±2K. The reaction proceeds with a rate coefficient of 1.6×10-9cm3s-1 and possesses the following product distribution: C4H2++S(0.45), HC4S++H(0.30), C3H2++CS(0.15), C4H++HS(0.10) and HCS++C3H(≤0.02). The sulphur-insertion product channel (HC4S++H) produces an ion which, upon dissociative recombination with electrons, leads to the radical C4S. Calculations show that the abundance of C4S produced in this manner in dense interstellar clouds is ≈8 per cent of the C2S abundance. The C2S radical has been previously observed in the interstellar cloud TMC-1 at a large fractional abundance with respect to H2 of 8×10-9. The C4S radical may therefore be sufficiently abundant in TMC-1 for observation.

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