振动激发态碘代烷烃分子的光解碎片平动能谱研究

处于振动激发态的母分子的光解动力学，是态-态反应动力学的重要内容，是调控化学反应向着有利方向进行的重要基础。振动激发态分子的光解动力学常常表现出与基态母分子光解有很大的差异。以往国内外的振动激发态分子光解的实验研究较少，且局限于高频振动模式的激发。本项目拟采用中-远红外激光技术，选择性激发模型分子碘代烷烃RI的C-I、C-H、C-C等振动模式，利用自行研制的高分辨光解碎片平动能谱仪，通过研究选定振动态激发下的母分子的光解碎片平动能谱，得到各种不同振动模式激发下母分子光解的一系列动力学数据，通过对比分析，探讨母分子的初始激发振动模式和能量在光解产物中是否保留或重新分配，探索初始的振动激发对分子光解动力学的影响，为实现调控化学反应提供基础依据。

The photodissociation dynamics of vibrationally excited molecule is an important part of the state-state molecular reaction dynamics, and is the important basis of the control of chemical reaciton. Compared to the ground state molecules, the photodissociation dynamics of vibrationally excited molecules often show signicantly different. The previous experimental study of the photodissociation dynamics of vibraionally excited molecules is very rare, and foucsing only on the vibrational modes of high frequency. Using our homebuilt high resolution mini-TOF photofragment translational spectrometer, we shall investigate the photodissociation of the RI molucule excited by mid-far IR laser for the slected vibrational mode, such as C-I, C-H, C-C stretching. By analysing these photodissociation translational spectra, various important dynamic information will be obtained, such as the branching ratios, the partitioning of the available energy, the internal state distribution of the fragments,the transformation of the original vibrational excition. The achievement of the photodissociation dynamic details of vibrationally excited molecule will supply theoretical knowledge for the control of the chemical reaction.