Rotationally Resolved Spectra of the B^2Π - X^2Π 0_0^0 and μ^2Σ - μ^2Σ 11_1^1 Transitions of C_6H and C_6D

Details Rotationally Resolved Spectra of the B^2Π - X^2Π 0_0^0 and μ^2Σ - μ^2Σ 11_1^1 Transitions of C_6H and C_6D Rotationally Resolved Spectra of the B^2Π - X^2Π 0_0^0 and μ^2Σ - μ^2Σ 11_1^1 Transitions of C_6H and C_6D

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mss..confewf10z&link_type=abstract

"International Symposium On Molecular Spectroscopy, 66th Meeting, Held 20-24 June, 2011 at Ohio State University. http://molspec

Astronomy and Astrophysics

Astronomy

Astronomical Species And Processes

Scientific paper

The linear carbon chain radicals have been topic of a series of spectroscopic studies. The hexatriynyl radical C_6H (and deuterated equivalent C_6D), a member of the linear C_nH series, has attracted renewed interest in recent years after the astronomical identification of its chemically related anion C_6H^- and its low-lying 11_1 μ^2Σ vobronic state. In this talk, rotationally resolved spectra of the B^2Π - X^2Π 0_0^0 and 11_1^1 transitions of both C_6H and C_6D are presented. Cavity ringdown spectroscopy is used to record the spectra in direct absorption through a supersonically expanding planar plasma. The μ^2Σ - μ^2Σ 11_1^1 vobronic hot bands are observed for the first time. Heavy rotational perturbations are found in the upper levels of C_6D. Precise spectroscopic parameters for the 11^1 μ^2Σ levels of both C_6H and C_6D are determined for the first time, and the spectroscopic parameters for the B^2Π 0^0 states are also improved. The Renner-Teller interaction is also discussed to estimate the excitation energies of the low-lying 11_1 μ^2Σ vibronic states.

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