%0 Journal Article
%T UV photodissociation dynamics of CH2I2 molecule<br>紫外波段CH2I2分子的光解离动力学研究
%A Xu Hai-Feng
%A Liu Shi-Lin
%A Ma Xing-Xiao
%A Dai Dong-Xu
%A Xie Jin-Chun
%A Sha Guo-He
%A <br>徐海峰
%A 刘世林
%A 马兴孝
%A 戴东旭
%A 解金春
%A 沙国河
%J 物理学报
%D 2002
%I 
%X Photodissociation dynamics of CH 2I 2 moleculae was investigated at different wavelengths of 277 to 305nm by an ion imaging spectrometer operated under optimal conditions for velocity mapping, where the ions were generated from (2+1) resonance-enhanced ionization (REMPI) of the photofragments I( 2P 3/2) and I *( 2P 1/2) at the same wavelength as that of the photolysis UV laser. The released kinetic energies and the angular distributions of both fragments at different photolysis wavelengths were derived from the three-dimensional velocity images. It was found that the photofragment of CH 2I radical was highly excited. About 80% of the total released energy deposits into internal freedom. This fact can be explained by the impulse model. A remarkable difference between the kinetic energy distributions of I( 2P 3/2) and I *( 2P 1/2) was found. The dissociation mechanism of the formation of both I( 2P 3/2) and I *( 2P 1/2) fragments is discussed in terms of anisotropy parameter and energy partition. The kinetic energy distributions of the I( 2P 3/2) and I *( 2P 1/2) fragments are determined by the adiabatic and nonadiabatic dissociation processes in the electronically excited states of CH 2I 2.
%K CH
%K 2I
%K 2
%K ion-velocity-imaging
%K adaibatic and nonadiabatic dissociation<br>CH2I2
%K 离子速度成像
%K 绝热和非绝热解离
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=446AA53B13701414&yid=C3ACC247184A22C1&vid=987EDA49D8A7A635&iid=0B39A22176CE99FB&sid=C812B90E96151014&eid=28F9D9CF04F424FF&journal_id=1000-3290&journal_name=物理学报&referenced_num=1&reference_num=16