Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...498l..89m&link_type=abstract
Astrophysical Journal Letters v.498, p.L89
Astronomy and Astrophysics
Astronomy
8
Ism: Molecules, Line: Identification, Molecular Data, Molecular Processes, Radio Lines: Ism
Scientific paper
The ring-chain C 9 H 2 molecule, formed by substituting the carbon chain C 6 H for one of the hydrogen atoms of the carbene ring C 3 H 2 , one of the more abundant astronomical molecules, has been detected in the laboratory by Fourier transform microwave spectroscopy. Fifteen a-type rotational transitions between 6 and 14 GHz were measured to 2 kHz or better, and precise values were determined for the rotational and centrifugal distortion constants. With these, the entire radio spectrum can be calculated to better than 1 km s ^{-1} in equivalent radial velocity over the range of interest to radio astronomy. The strongest lines of C 9 H 2 , like those of the smaller ring chain C 7 H 2 , were obtained with a diacetylene-neon discharge but were about 10 times weaker. Ab initio calculations have not been done for C 9 H 2 , and isomeric energies are not known, but by analogy with the shorter members of the sequence, the ring-chain carbene here is probably the most stable structure. Of the many possible isomers of C 9 H 2 , several may lie low enough in energy to be detectable in the laboratory and in space with present techniques. Ions and radicals with ring-chain structures are also excellent candidates for laboratory and astronomical detection.
Chen Wei
Gottlieb Carl A.
McCarthy Mary C.
Thaddeus Patrick
Travers M. J.
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