物理化学学报 >> 2001, Vol. 17 >> Issue (09): 840-844.doi: 10.3866/PKU.WHXB20010917

研究简报 上一篇    下一篇

NH2(A2A1,090,423)的电子猝灭和转动态-态传能

沈关林;张敏;董峰;李学初;王秀岩   

  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
  • 收稿日期:2001-02-13 修回日期:2001-05-04 发布日期:2001-09-15
  • 通讯作者: 沈关林 E-mail:shengl@ms.dicp.ac.cn

Quenching and Rotational State-to-State Energy Transfer of NH2(A2A1,090,423)

Shen Guan-Lin;Zhang Min;Dong Feng;Li Xue-Chu;Wang Xiu-Yan   

  1. State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023
  • Received:2001-02-13 Revised:2001-05-04 Published:2001-09-15
  • Contact: Shen Guan-Lin E-mail:shengl@ms.dicp.ac.cn

摘要: 在束气和束束实验条件下,详细研究了NH2(A1,090,423)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 nm2),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NH3具有较大的偶极矩以及O2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.

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

Abstract: 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 sections σQ 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.

Key words: Energy transfer of electronically excited state, Single collision,  Collision-complex model, NH2 free radical