NH_2(~2A_1,090,4_(23))的电子猝灭和转动态-态传能  

Quenching and Rotational State-to-State Energy Transfer of NH_2(~2A_1,090,4_(23))

作　　者：沈关林[1] 张敏[1] 董峰[1] 李学初[1] 王秀岩[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：《物理化学学报》2001年第9期840-844,共5页Acta Physico-Chimica Sinica

基　　金：国家科技部NKBRSF;国家自然科学基金(29973046)资助项目

摘　　要：在束-气和束-束实验条件下，详细研究了NH_2(~2A_1,090,4_(23))自由基分别与 Ar,N2,O2和 NH3碰撞引起的电子态猝灭和转动态-态传能，获得了总的猝灭截面σQ (分别为≤ 0.17、 0.26、 0.30和 0.48 nm^2)，以及相对转动态-态传能截面 .利用碰撞络合物模型计算的电子猝灭截面与实验测得的截面具有基本相同的趋势，表明长程吸引势在猝灭过程中起着重要的作用 .同时还发现，转动态-态传能中相对截面随着碰撞对的折合质量的减小而下降 .由于 NH_3具有较大的偶极矩以及 O_2的开壳层电子结构使得猝灭截面增大，而转动态-态传能截面减小 .The study of quenching and rotational state- to- state energy transfer of NH2(A1,090,423) with Ar,N2,O2, and NH3 was performed at single collisional conditions. The total quenching cross sectionsσ Q for the four partners have been measured to be≤ 0.17 nm2， 0.26 nm2， 0.30 nm2 and 0.48 nm2, respectively. The relative cross sections of rotational state- to- state energy transfer were obtained by measuring the dispersed fluorescent spectra. A collision- complex model was used to calculate the quenching cross sections and the theoretical and experimental values show the same trend. This indicates that long range attractive interactions play an important role in the quenching process. It was also found that the relative cross sections of rotational energy transfer decrease approximately with decreasing the reduced mass of the collision- pair. NH3 and O2 present the larger quenching cross sections and smaller cross sections of rotational energy transfer due to the larger dipole momentum and the electronic structure of open- shell, respectively.

关 键 词：电子激发态传能 单次碰撞 碰撞络合物模型 NH2自由基 电子猝灭 氮氢自由基 

分 类 号：O562[理学—原子与分子物理]