Detection of the Carbon Chain Negative Ion C8H- in TMC-1

Details Detection of the Carbon Chain Negative Ion C8H- in TMC-1 Detection of the Carbon Chain Negative Ion C8H- in TMC-1

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...664l..43b&link_type=abstract

The Astrophysical Journal, Volume 664, Issue 1, pp. L43-L46.

Astronomy and Astrophysics

Astronomy

65

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

Scientific paper

The negative molecular ion C8H- has been detected in the Galactic molecular source TMC-1. Four rotational transitions have been observed in the centimeter-wave band with the NRAO 100 m Green Bank Telescope (GBT) at precisely the frequencies calculated from the recent laboratory spectroscopy of this large carbon chain anion. C8H- is about 5% as abundant as C8H, or somewhat more than C6H- relative to C6H (1.6%). Improved values of the column densities of C6H- and C6H, and an upper limit for the abundance of the smaller carbon chain C4H- of 0.014% with respect to C4H, have also been determined.

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