高等学校化学学报 ›› 1997, Vol. 18 ›› Issue (9): 1511.

• 论文 • 上一篇    下一篇

266nm激光激励的SO2(X1A1,A1A2,B1B1)体系的态间转移研究

张群, 张桦, 陈从香, 俞书勤, 马兴孝   

  1. 中国科学技术大学化学物理系, 合肥 230026
  • 收稿日期:1996-08-27 出版日期:1997-09-24 发布日期:1997-09-24
  • 通讯作者: 陈从香.
  • 作者简介:张群, 男, 27岁, 博士研究生
  • 基金资助:

    国家自然科学基金

Kinetic Studies for State-State Transition of SO2(X1A1,A1A2, B1B1) System Excited by266 nm Laser

ZHANG Qun, ZHANG Hua, CHEN Cong-Xiang, YU Shu-Qin, MA Xing-Xiao   

  1. Department of Chemical Physics, University of Science and Technology of China, Hefei 230026
  • Received:1996-08-27 Online:1997-09-24 Published:1997-09-24

摘要: 用YAG四倍频激光把SO2分子从电子基态X1A1激励到电子激发态A1A2和B1B1的高振动耦合区, 获得了320~380um范围内SO2(B1B1→X1A1)的激光诱导荧光色散谱, 并给出初步标识;提出一个三能态模型来处理266nm激光激励的SO2(X1A1, A1A2, B1B1)体系的态间转移, 并获得了A态和B态在高振动能区的耦合系数ξ及耦合达到动态平衡的弛豫时间τ, 发现二者反映的是被研究体系的固有特性, 与提出的模型吻合.

关键词: 三能态模型, 耦合系数, 弛豫时间

Abstract: The dispersed fluorescence spectrum of SO2 (B1B1→X1A1. 320~380 nm) excitedby 266 nm laser lnto the first allowed absorptlon reglon (240~340 nm) where the high vibrational levels of A1A2 an B1B1 states are strongly coupled, and its preliminary assignment arepresented. Athree-level model ls proposed to deal with the SO2 (X1A1, A1A2, B1B1) systern,and the coup1ing coefficlent, ξ, and the relaxation time, τ, at tlie high vibratlonal levels ofA1A2 and B1B1 states have been obtalned. The results show that ξ and τ keep basically constant under our exl)erimental conditions, which reflects the cI1aracteristics of the system.

Key words: Three-level model, Coupling coefficient, Relaxation time

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