The chemistry of silicon in hot molecular cores

Details The chemistry of silicon in hot molecular cores The chemistry of silicon in hot molecular cores

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.274..694m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 274, Issue 3, pp. 694-700.

Astronomy and Astrophysics

Astronomy

30

Molecular Processes, Ism: Clouds, Ism: Molecules

Scientific paper

The gas-phase chemistry of hot molecular cores is thought to depend upon the composition of evaporated ice mantle and its subsequent gas-phase reactions. Hydrogenated species are thought to predominate within the ices. Since monosilane, SiH_4, is the likely reservoir for silicon, we have modelled its influence upon hot core chemistry. For a range of likely temperatures and densities, we find that its evaporation results in substantial fractional abundances of SiO, along with H_2SiO and HNSi, in a time-scale of a fewx10^4 yr, while itself remaining the major gas-phase silicon species. In the absence of available molecular oxygen, atomic silicon and carbon-silicon species such as HCSi and SiCH_2 are shown to become increasingly abundant.

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