Gas-Electronic Spectra of Carbon Chains - Relevance to Astrophysics

Details Gas-Electronic Spectra of Carbon Chains - Relevance to Astrophysics Gas-Electronic Spectra of Carbon Chains - Relevance to Astrophysics

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.4104m&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #41.04; Bulletin of the American Astronomical Society, Vol. 31, p.881

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Electronic spectra of a number of carbon chain molecules and ions have been observed in the gas-phase. The carbon anions C_n n=4-11 were detected by a two colour excitation-photodetachment approach using a supersonic discharge source. The transitions of the carbon radicals C2nH and the polyacetylene cations HC2nH(+) , n=3-5, were measured by cavity ring down spectroscopy across a slit jet-discharge. These data provide a direct comparison with astrophysical measurements, in particular of the diffuse interstellar bands DIBs, under similar temperature conditions. The origin and vibronic bands in the electronic spectrum of C_7(-) show striking matches with narrow DIBs, providing the first compelling evidence for the identification of a DIB carrier. The laboratory data on this anion and on the other carbon chains provide a unique opportunity for specific astronomical measurements.

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