Study of hot bands in the B2$\Sigma$+u-X2$\Sigma$+g system of C-2 anion

doi:10.1088/1009-1963/12/7/308

Chinese Physics, 2003, Vol. 12(7): 745-749
DOI: 10.1088/1009-1963/12/7/308

ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS

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Study of hot bands in the B² $Σ$ ⁺_u-X² $Σ$ ⁺_g system of C^-₂ anion

Yu Shan-Shan (喻姗姗)^a, Yang Xiao-Hua (杨晓华)^a, Li Ben-Xia (李本霞)^a, Kaniki Kakule^b, Wu Sheng-Hai (吴升海)^a, Guo Ying-Chun (郭迎春)^a, Liu Yu-Yan (刘煜炎)^a, Chen Yang-Qin(陈扬骎)^c

^a Key Laboratory of Optical & Magnetic Resonance Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062, China; ^b University of Kinshasa, Faculty of Engineering, P.O. Box 255 Kinshasa 11, Dem. Rep. of Congo; ^c Department of Physics, East China Normal University, Shanghai 200062, China

Abstract

Abstract Optical heterodyne magnetic rotation enhanced velocity modulation spectroscopy was employed to observe the visible absorption spectra of the

B^{2} Σ_{u}^{+} - X^{2} Σ_{g}^{+}

electronic transition of C

_{2}^{-}

. Four hot bands (0,1), (1,2), (2,3) and (3,4) have been observed and the band (3,4) is measured directly for the first time, so far as we know, by absorption. A rotational analysis was carried out to obtain molecular constants. With the Franck－Condon principle and the vibrational Boltzmann distribution, we have estimated the vibrational temperature of C

_{2}^{-}

to be about 3000K.

Keywords: C^-_2 anion velocity modulation spectroscopy vibrational temperature

Received: 10 December 2002
Revised: 10 January 2003
Accepted manuscript online:

PACS:	33.70.Ca	(Oscillator and band strengths, lifetimes, transition moments, and Franck-Condon factors)
	33.15.Mt	(Rotation, vibration, and vibration-rotation constants)
	33.20.Kf	(Visible spectra)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 10174020, 10204007) and Shanghai Priority Academic Discipline.

Cite this article:

Yu Shan-Shan (喻姗姗), Yang Xiao-Hua (杨晓华), Li Ben-Xia (李本霞), Kaniki Kakule, Wu Sheng-Hai (吴升海), Guo Ying-Chun (郭迎春), Liu Yu-Yan (刘煜炎), Chen Yang-Qin (陈扬骎) Study of hot bands in the B² $Σ$ ⁺_u-X² $Σ$ ⁺_g system of C^-₂ anion 2003 Chinese Physics 12 745

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Study of hot bands in the B² $Σ$ ⁺_u-X² $Σ$ ⁺_g system of C^-₂ anion