Ultrafast dynamics and dissociative ionization of CS2 molecules studied via the femtosecond pump-probe method

被引：0

作者：

ZHANG DongDong

机构：

来源：

Science Bulletin | 2011年 / 09期

基金：

中国国家自然科学基金;

关键词：

ultrafast dynamics; femtosecond; pump-probe; carbon disulfide;

D O I：

暂无

中图分类号：

O561.4 [分子间的作用、激发与离解];

学科分类号：

070203 ; 1406 ;

摘要：

The ultrafast dynamics and dissociative ionization of CS2 were studied using the pump-probe method with time-of-flight mass spectroscopy. The transient behavior of both parent ion (CS2+) and fragment ions (S+ and CS+) was observed. It was found that all the ionic signals decay exponentially with lifetimes that were different for delay times, t>0 and t<0, which can be attributed to the evolution of different Rydberg states pumped by 267-nm and 400-nm laser pulses. The lifetimes of two Rydberg states were obtained simultaneously from one fitting of the transients. The fragment ions were produced by the dissociation of CS2+, and it is suggested that the final ionic state is the C2Σg+ state of CS2+ based on the measured S+/CS+ branching ratio. The S+/CS+ ratio is dependent on the delay time of the two lasers, indicating that the dissociation process of CS2+ is related to the evolution of the intermediate Rydberg state.

引用

页码：855 / 861

页数：7

共 9 条

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