用色散荧光研究NH_2(■~2A_1)转动态-态传能  

The Study on State-to-State Rotational Energy Transfer in NH_2(■~2A_1) by Dispersion Fluorescence Spectrum

作　　者：王黎明[1] 李学初[1] 沈关林[1] 徐大东[1] 陈宏[1] 楼南泉[1] 

机构地区：[1]中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连116023

出　　处：《Chinese Journal of Chemical Physics》1993年第5期392-397,共6页化学物理学报（英文）

基　　金：国家攀登计划项目

摘　　要：利用脉冲染料激光制备NH_2(■~2 A_1)单一转动能态∑(0,9,0)3_(03),在分子束条件下研究它的态一态转动传能至∑(0,9,0)5_(05),1_(01)和△(0,9,0)6_(25),5_(23),4_(23),3_(21),2_(21)各转动能态的相对截面。结果表明:转动跃迁|△N|>2几率极小,|△N|愈小,传能截面愈大,而且同一电子振动态内传能最有效,且向下跃迁快于向上跃迁。分析荧光谱可以看出碰撞前后转动能级的对称性不变,这是在单次碰撞条件下得到的最新实验结果。Single rotational state 3_(03) of NH_2(A^(～2),A_1)Σ(0,9,0) is produced by laser excitation of NH_2 (X^(～2)B_1) at molecular beam condition. The relative cross sections of rotational energy transfer between Σ(0,9,0,) 3_(03) and Σ (0,9,0) 5_(05), 1_(01), Δ(0,9,0) 6_(25), 5_(23), 4_(23), 3_(21), 2_(21) have been obtained. The results show that the probabilities of rotational energy tranfer for ΔN>2 are very low, and the smaller the ΔN values, the larger the energy transfer cross sections. The energy transfer occurs preferentially at the same vibronic state and the downward transition prabadility is larger than one for the upward transition. The symmetry of the rotational energy levels is conserved during the collision process. The results reported here are the newest obtained at single collision condition.

关 键 词：色散荧光 转动传能 三原子自由基 

分 类 号：O561.3[理学—原子与分子物理]