The Radio Spectra of SICCH, SICN, and SINC

Details The Radio Spectra of SICCH, SICN, and SINC The Radio Spectra of SICCH, SICN, and SINC

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...536l..55a&link_type=abstract

The Astrophysical Journal, Volume 536, Issue 1, pp. L55-L58.

Astronomy and Astrophysics

Astronomy

19

Ism: Molecules, Line: Identification, Molecular Data, Molecular Processes, Radio Lines: Ism

Scientific paper

Three new silicon-bearing radicals of astrophysical interest, SiCCH and the two nearly isoenergetic isomers SiCN and SiNC, were detected in a laboratory discharge in their X2Π ground states by Fourier transform microwave and millimeter-wave absorption spectroscopy. Hyperfine structure was observed in the low rotational transitions of the 2Π1/2 ladder, and well-resolved Λ-doubling was observed in both fine-structure ladders. With the spectroscopic constants derived from the laboratory measurements, the spectra of all three can be calculated to an uncertainty of less than 0.1 km s-1 in equivalent radial velocity over the entire range of interest to radio astronomers. SiCN, with a dipole moment of 2.9 D, is probably the most promising of the three for astronomical discovery.

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