SiH and the unidentified 4.6 micron feature

Details SiH and the unidentified 4.6 micron feature SiH and the unidentified 4.6 micron feature

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329l.113n&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 329, June 15, 1988, p. L113-L116.

Astronomy and Astrophysics

Astrophysics

30

Infrared Spectra, Interstellar Matter, Molecular Clouds, Proton Irradiation, Silanes, Stellar Envelopes, Amorphous Materials, High Resolution, Hydrogen Atoms

Scientific paper

Results from experimental studies of the irradiation of SiH4-H2O and Fe(CO)5-SiH4-H2O ice mixtures at 15K using 1 MeV protons have revealed the synthesis of a very stable infrared spectral feature at 4.6 μm which is characteristic of the SiH functional group. This feature persists through warmup of the ice, exposure to air at 300K, and vacuum annealing to at least 400K. Because of the high cosmic abundance of both silicon and hydrogen and the unexpected stability of the SiH feature in these experiments, the authors suggest that SiH might be responsible for the 4.6 μm absorption feature observed in W33A.

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