Laser Spectroscopy of the Carbon Chains HC_7H and HC_9H

Details Laser Spectroscopy of the Carbon Chains HC_7H and HC_9H Laser Spectroscopy of the Carbon Chains HC_7H and HC_9H

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...523l..89b&link_type=abstract

The Astrophysical Journal, Volume 523, Issue 1, pp. L89-L91.

Astronomy and Astrophysics

Astronomy

9

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

Scientific paper

Strong vibronic bands of the ^3Sigma^-_u<--X^3Sigma^-_g transition of the linear triplet radicals HC_7H and HC_9H have been measured in the gas phase by cavity ringdown spectroscopy. The origin band of HC_7H and the origin and nu_3 bands of HC_9H all exhibit well resolved P and R branches. For HC_9H, the origin band is within 1 Å of the diffuse interstellar band lambda5818, yet insufficiently close for positive identification. In both molecules, internal conversion is much more rapid than radiative emission, and fluorescence is not observed. Lower limits on the radiationless lifetime of the upper state of the origin band are determined to be 0.1 ns for HC_7H and 0.01 ns for HC_9H. Because the origin bands of these two radicals are about equally intense, it should be possible to detect longer members of the series in the gas phase.

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