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.
基金
国家攀登计划项目
