405nm飞秒强激光场中H_2的碎裂研究（英文）  

Fragmentation of H_2 in 405 nm intense femtosecond laser field

作　　者：郭玮[1,2] 常志强 李月华[1] GUO Wei1,2, CHANG Zhiqiang1, LI Yuehua1(1 School of Electrical Engineering, University of South China, Hengyang 421001, China; 2 State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Chin)

机构地区：[1]南华大学电气工程学院,湖南衡阳421001 [2]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,辽宁大连116023

出　　处：《量子电子学报》2018年第2期129-135,共7页Chinese Journal of Quantum Electronics

基　　金：Supported by National Natural Science Foundation of China,11704178;Natural Science Foundation of Hunan Province,2015JJ3104;Research Foundation of Education Bureau of Hunan Province,15B204~~

摘　　要：使用速度成像法测得了405 nm飞秒激光脉冲下H^+的动能分布和角分布。讨论了解离通道H_2^+→H^++H、H_2^(2+)→H^++H^+的反应路径,前者产生于经由1ω交叉的直接单光子路径,后者产生于H_2^(2+)的库仑爆炸。H_2^+到H_2^(2+)的电离起始于键软化,各通道的相对峰高说明H_2^+的解离和电离是竞争的。低场强加强H_2^+的解离,高场强支持H_2^+的电离。The kinetic energy and angular distributions of H^＋ as a function of 405 nm femtosecond laser intensity are experimentally measured by using velocity map imaging technique. The reaction pathways of dissociation channels, H2^＋ → H^＋ ＋ H and H2^2＋ → H^＋ ＋ H^＋, are discussed. The former is due to the direct one-photon pathway via the lw crossing, and the latter stems from Coulomb explosion of H2^2＋. Ionization of H2^＋ to H2^2＋ starts from bond softening. The relative yield of fragment peak indicates that dissociation and ionization of H2^＋ are competitive. The lower laser intensity emphasizes the dissociation of H2^＋, and the higher laser intensity favors the ionization of H2^＋.

关 键 词：光谱学 反应路径 速度映像成像 光缀饰态 

分 类 号：O431.2[机械工程—光学工程]