中国物理B ›› 2003, Vol. 12 ›› Issue (7): 745-749.doi: 10.1088/1009-1963/12/7/308

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Study of hot bands in the B2Σ+u-X2Σ+g system of C-2 anion

陈扬骎1, 喻姗姗2, 杨晓华2, 李本霞2, 吴升海2, 郭迎春2, 刘煜炎2, Kaniki Kakule3   

  1. (1)Department of Physics, East China Normal University, Shanghai 200062, China; (2)Key Laboratory of Optical & Magnetic Resonance Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062, China; (3)University of Kinshasa, Faculty of Engineering, P.O. Box 255 Kinshasa 11, Dem. Rep. of Congo
  • 收稿日期:2002-12-10 修回日期:2003-01-10 出版日期:2003-07-16 发布日期:2005-03-16
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10174020, 10204007) and Shanghai Priority Academic Discipline.

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    

  1. 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
  • Received:2002-12-10 Revised:2003-01-10 Online:2003-07-16 Published:2005-03-16
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10174020, 10204007) and Shanghai Priority Academic Discipline.

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摘要： Optical heterodyne magnetic rotation enhanced velocity modulation spectroscopy was employed to observe the visible absorption spectra of the B^2Σ^+_u-X^2Σ^+_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.

关键词: C^-_2 anion, velocity modulation spectroscopy, vibrational temperature

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.

Key words: C^-_2 anion, velocity modulation spectroscopy, vibrational temperature

中图分类号:  (Oscillator and band strengths, lifetimes, transition moments, and Franck-Condon factors)

  • 33.70.Ca
33.15.Mt (Rotation, vibration, and vibration-rotation constants) 33.20.Kf (Visible spectra)