Laboratory detection and astronomical identification of a new free radical, CCS 3Sigma/-/

Details Laboratory detection and astronomical identification of a new free radical, CCS 3Sigma/-/ Laboratory detection and astronomical identification of a new free radical, CCS 3Sigma/-/

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...317l.115s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 317, June 15, 1987, p. L115-L118.

Astronomy and Astrophysics

Astrophysics

113

Astronomical Spectroscopy, Carbon Compounds, Free Radicals, Interstellar Matter, Sulfides, Carbon Disulfide, Gas Mixtures, Line Spectra, Microwave Spectra, Molecular Energy Levels, Molecular Rotation

Scientific paper

The linear CCS radical has been detected, for the first time, by laboratory microwave spectroscopy, and four unidentified lines including the U45379 line from TMC-1 and seven from Sgr B2 have been assigned to the transitions of this radical. The radical was produced in a free-space absorption cell by a dc glow discharge in a mixture of CS2 and He. Twenty-nine lines were observed in the frequency region up to 300 HGz and were least-squares analyzed to determine the detailed molecular constants. Two strong unidentified lines, U45379 and U22344, were assigned to the F1 components, J(N) = 4(3)-3(2) and 2(1)-1(0), respectively. The J(N) = 2(1)-1(0) transition of CC(S-34) was also observed in TMC-1. The column densities of CCS in Sgr B2 and TMC-1 are estimated to be (6 + or - 1) x 10 to the 13th and (8 + or - 2) x 10 to the 13th per sq cm, respectively.

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