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Predissociation Dynamics of B State of Methyl Iodide with Femtosecond Pump-probe Technique
Zheng-rong Wei1,2, Feng Zhang1,2, Yan-mei Wang1,2, Bing Zhang*1,2
1.State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;2.Graduate School of Chinese Academy of Sciences, Beijing 100039, China
Abstract:
The predissociation dynamics of B Rydberg state of methyl iodide is studied with femtosecond two-color pump-probe time-of-°ight spectra at pump pulse of 400 nm and probe pulse of 800 nm. The dominant product channels are the CH3I+ and CH3+ formation. The time-dependent signals for CH3I+ and CH3+ ions are obtained. Both of the signal curves can be ˉtted by biexponential decays with time constants of ?1 and ?2, ?1 is assigned to the lifetimes of high Rydberg states, which can be accessed by absorbing three 400 nm pump pulses and ?2 re°ects the dynamics of B Rydberg state, which is accessed with two pump pulses. The lifetime of B Rydberg state is determined to be about 1.57 ps, which is incredibly consistent with the previous studies. The results were interpreted as a multiphoton dissociative ionization processes.
Key words:  Methyl iodide, Predissociation, Pump-probe, Femtosecond
FundProject:国家自然科学基金
利用飞秒泵浦探测技术研究碘甲烷B态预解离动力学
魏政荣,张锋,王艳梅,张冰*
中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室,武汉430071
摘要:
应用飞秒双光泵浦-探测技术结合飞行时间质谱研究了碘甲烷分子的B态预解离动力学,其中泵浦光波长为400 nm,探测光为800 nm,碘甲烷主要的产物通道为生成CH3I+和CH3+.改变泵浦与探测光之间的延时,得到了这两种离子的时间演化曲线,每个曲线都可以用两个指数函数来拟合,拟合常数为?1和?2,?1反映了碘甲烷分子吸收三个泵浦激光所到达的高里德堡态的动力学,?2反映了吸收两个泵浦激光所到达的B里德堡态的动力学,得到的B态的带源寿命为1.57 ps,这个值和以前的文献非常符合,试验结果被解释为多光子的电离解
关键词:  碘甲烷,预解离,泵浦-探测,飞秒
DOI:10.1088/1674-0068/20/04/419-424
分类号: