Ultrafast dynamics and dissociative ionization of CS(2) molecules studied via the femtosecond pump-probe method

作者：Zhang DongDong; Fan Zhen; Sun ErPing; Zhang JunFeng; Liu Hang; Xu HaiFeng^*; Jin MingXing; Ding DaJun

来源：Chinese Science Bulletin, 2011, 56(9): 855-861.

DOI：10.1007/s11434-010-4325-7

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

The ultrafast dynamics and dissociative ionization of CS(2) were studied using the pump-probe method with time-of-flight mass spectroscopy. The transient behavior of both parent ion (CS(2) (+)) 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 CS(2) (+), and it is suggested that the final ionic state is the C(2)I (g) pound (+) state of CS(2) (+) 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 CS(2) (+) is related to the evolution of the intermediate Rydberg state.

• 出版日期2011-3
• 单位吉林大学