Study of hot bands in the B2$\Sigma$+u-X2$\Sigma$+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 Kakuleb, 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 Optical heterodyne magnetic rotation enhanced velocity modulation spectroscopy was employed to observe the visible absorption spectra of the $B^2\Sigma_{\rm u}^+-X^2\Sigma_{\rm g}^+$ 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.
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)
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$\Sigma$+u-X2$\Sigma$+g system of C-2 anion 2003 Chinese Physics 12 745
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