The Radio Spectrum of Si3

Details The Radio Spectrum of Si3 The Radio Spectrum of Si3

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...592l..91m&link_type=abstract

The Astrophysical Journal, Volume 592, Issue 2, pp. L91-L93.

Astronomy and Astrophysics

Astronomy

2

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

Scientific paper

The silicon trimer Si3 and several of its rare isotopic species have been detected in the laboratory, and the frequencies of 66 rotational transitions in the range 5-42 GHz have been measured to a few parts in 107. The most intense radio lines can be calculated from the derived spectroscopic constants to better than 3 km s-1 in equivalent radial velocity up to frequencies of 50 GHz, adequate for a deep search in the best astronomical sources; above that frequency the uncertainties increase to of the order of 20 km s-1 at 160 GHz, which is still sufficient for a deep search in a wide-line source such as IRC +10216.

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