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- W1968447075 abstract "A time-dependent treatment of chemical modelling in dense interstellar clouds has been used to investigate the effects of different initial values for the carbon:oxygen ([C]/[O]) abundance ratio. The chemical network used involves 44 species (nitrogen chemistry omitted) and a range of cloud densities from n(H2) = 103 to 106 cm−3. If excess carbon remains after CO formation, which dominates all usage of C and O, this leads to enhanced quantities of CS and H2CS. For a residual excess of oxygen the enhanced sulphur species are OCS and SO2 with SO only peaking for [C]/[O] near to the solar ratio. The chemistry is not driven by collisions with H2 molecules, and does not produce strong molecular enhancements with increasing density. Any enhancements that appear are due to a higher abundance of neutral species in denser clouds which participate in the dominant neutral–neutral processes. As the density is increased so the abundances of OCS, SO2, and H2S rise. Depletion of atomic sulphur from the solar value results in a linear depletion of each sulphur-bearing molecule." @default.
- W1968447075 created "2016-06-24" @default.
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- W1968447075 date "1985-03-01" @default.
- W1968447075 modified "2023-09-25" @default.
- W1968447075 title "Time-dependent chemistry - III. The effects of sulphur and oxygen depletion on the interstellar abundances of sulphur-bearing molecules" @default.
- W1968447075 doi "https://doi.org/10.1093/mnras/213.2.157" @default.
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