物理化学学报2009，Vol.25Issue(8)：1708-1712,5.
氯碘甲烷在A带的光解动力学
Photodissociation Dynamics of Chloroiodomethane in the A-Band
摘要
Abstract
The photodissociation dynamics of chlomiodomethane in the A-band has been investigated by ion velocity imaging coupled with a resonance enhanced multiphoton ionization(REMPI)scheme．Translational energies and angular distributions of the corresponding photofragments were obtained by detecting ion images of I*(5p2p1/2)and I(5p2p3/2)at 266 and 277 nm Single-peaked Gaussian translational energy distributions were found for I and I* and could be interpreted in terms of the soft radical approximation．The formation of I and I* took place via a fast direct dissociation process on a repulsive potential energy surface．The obtained anisotropy parameter B proved that the existence of a nonadiabatic transition between the 3Q0 and 1Q1 states，and excitation at these wavelengths was predominated to the 3Q0 state．The nonadiabatic transition between the 3Q0 and 1Q1 states is stronger at shorter wavelengths．Around 235 Bm，the isotropic Cl and Cl* ion images suggest that the observed chlorine atoms come from the secondary UV photodissociation of CH2C1 radicals which arc initially produced by the photodissociation of CH2ICl．关键词
光解离/离子速度影像/氯碘甲烷/二次解离Key words
Photodissociation/Ion velocity imaging/Chloroiodomethane/Secondary photodissociation process分类
化学化工引用本文复制引用
张昌华,张延,张嵩,张冰..氯碘甲烷在A带的光解动力学[J].物理化学学报,2009,25(8):1708-1712,5.基金项目
The project was supported by the National Natural Science Foundation of China(20673140,20703060)and Science and Technology Research Foundation of Hubei Provincial Department of Education,China(Z20082601).国家自然科学基金(20673140,20703060)和湖北省教育厅科学技术研究基金(Z20082601)资助项目 （20673140,20703060）
