Sulfur chemistry in dense interstellar clouds
A model is presented for the gas phase chemistry of molecules containing sulfur in dense interstellar clouds. The sulfur chemistry is different from that used in previous models as a result of an extensive search of the recent literature and the availability of new laboratory data. The changes have a significant effect on the calculated abundance of sulfur compounds. The linked chemistry of sulfur and oxygen in the present model requires a severe depletion of sulfur and low fractional abundances of both O and O/sub 2/ in the dense clouds. In contrast, the high abundance of SO and the low abundance of CS relative to SO in the HVS in the KL may indicate an oxygen-rich, high temperature environment compared to OMC-1. The formation of S-H bonds is slow because of the absence of radiative association between S/sup +/ and H/sub 2/. The present model underestimates the abundance of H/sub 2/S unless a radiative association reaction between HS/sup +/ and H/sub 2/ is postulated.
- Research Organization:
- Jet Propulsion Laboratory, California Institute of Technology
- OSTI ID:
- 6849201
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 260:2; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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