强飞秒激光场辐照下 1-溴-2-氯乙烷的离解双电离。

Dissociative double ionization of 1-bromo-2-chloroethane irradiated by an intense femtosecond laser field.

机构信息

State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062, People's Republic of China.

出版信息

J Chem Phys. 2011 Aug 14;135(6):064303. doi: 10.1063/1.3620176.

DOI:10.1063/1.3620176

PMID:21842929

Abstract

The dissociative double ionization and multi-photon ionization of 1-bromo-2-chloroethane (BCE) irradiated by the 800 nm femtosecond laser field have been investigated by dc-slice imaging technology. The charged parent ion ratio [BCE(2+)]/[BCE(+)] was measured, and the corresponding ionization process including non-sequential double ionization and sequential double ionization was analyzed. The sliced images of different photo-dissociated ions were detected, and the corresponding kinetic energy release (KER) distributions were calculated and extracted. Furthermore, the dissociative double ionization channels, attributed to the cleavage of the C-C, C-Br, and C-Cl bonds by the Coulombic repulsive forces, were discussed, and the revised equilibrium distance R(e), the energy ratio E(exp)/E(coul), and the value a=√(R(e))/(E(exp)/E(coul)) were calculated.

摘要

用 dc-slice 成像技术研究了 800nm 飞秒激光场辐照下 1-溴-2-氯乙烷（BCE）的离解双电离和多光子电离。测量了带电荷的母体离子比 [BCE(2+)]/[BCE(+)]，并分析了包括非顺序双电离和顺序双电离在内的相应电离过程。探测到不同光解离子的切片图像，并计算和提取相应的动能释放（KER）分布。此外，讨论了离解双电离通道，归因于库仑斥力导致的 C-C、C-Br 和 C-Cl 键的断裂，并计算了修正的平衡距离 R(e)、能量比 E(exp)/E(coul)和值 a=√(R(e))/(E(exp)/E(coul))。