THE RADIO SPECTRA OF SICCH, SICN AND SiNC

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2000

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Ohio State University

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Three new silicon-bearing radicals of astrophysical interest, SiCCH, SiCN and SiNC, were detected in a laboratory discharge in their $X^{2}\Pi$ ground states by Fourier transform microwave and direct absorption millimeter-wave spectroscopy. Well-resolved $\Lambda$-doubling was observed in both fine structure components, and hyperfine structure was observed in the low rotational transitions of the $^{2}\Pi_{1/2}$ ladder. With the spectroscopic constants derived from the laboratory measurements, the spectra of the three radicals 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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Author Institution: Harvard-Smithsonian Center for Astrophysics

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