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Photodissociation of HOD via the Ĉ1B1 State: OD/OH Branching Ratio and OD Bond Dissociation Energy
Li-na Cheng, Yuan Cheng, Kai-jun Yuan*, Qing Guo, Tao Wang, Dong-xu Dai, Xue-ming Yang*
State key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Abstract:
Photodissociation of jet-cooled HOD via the ? state around 124 nm has been studied using the H(D)-atom Rydberg tagging time-of-flight technique. Rotational state resolved action spectrum and the product translational energy distribution spectra have been recorded for both D+OH and H+OD dissociation channels. Product channel OH/OD branching ratios for the individual ?- X rotational transition have been determined. A comparison is also given with the B- X and ?- X transitions. In addition, the dissociation energy of the OD bond in HOD has been determined accurately to be 41751.3±5 cm-1.
Key words:  Photodissociation, Rydberg tagging, Branching ratio, Dissociation energy
FundProject:
HOD分子在?1B1态的光解动力学: 产物OH/OD的分支比以及OD键解离能
程丽娜, 程元, 袁开军*, 郭庆, 汪涛, 戴东旭, 杨学明*
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
摘要:
利用H(D)原子里德堡态时间飞渡谱技术研究了HOD超声射流分子束在124 nm附近的?态光解动力学.实验测量了HOD分子在?态的转动分辨的吸收谱,并得到了五个转动峰下H+OD以及D+OH通道的产物总的平动能谱.通过对产物平动能谱的分析,得到了?态解离产物OH和OD的分支比,并与Β态和?态相应解离产物的分支比做了对比.实验结果确定了HOD分子OD键的解离能为41751.3±5 cm-1.
关键词:  光解,里德堡态,分支比,解离能
DOI:10.1088/1674-0068/24/02/129-133
分类号: