Laboratory Detection of HC6N, a Carbon Chain with a Triplet Electronic Ground State

Details Laboratory Detection of HC6N, a Carbon Chain with a Triplet Electronic Ground State Laboratory Detection of HC6N, a Carbon Chain with a Triplet Electronic Ground State

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...540..286g&link_type=abstract

The Astrophysical Journal, Volume 540, Issue 1, pp. 286-291.

Astronomy and Astrophysics

Astronomy

3

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

Scientific paper

A linear triplet isomer of HC6N has been detected by Fourier transform microwave spectroscopy in a supersonic molecular beam. A total of 85 hyperfine components from six rotational transitions between 8 and 18 GHz were measured to an uncertainty of 5 kHz; a similar set of transitions were detected for the 15N isotopic species, produced using an isotopically enriched precursor gas sample. The spectroscopic constants for both species, including the fine and hyperfine coupling constants, were determined to very high accuracy, and these allow calculation of the radio spectrum to a fraction of 1 km s-1 in equivalent radial velocity. Triplet HC6N is a highly polar, low-lying isomer; measurements show it to be about 10 times more abundant than a ring-chain isomer recently detected with the same spectrometer.

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