Above-threshold detachment of negative ions by circularly polarized few-cycle laser fields  

作　　者：白丽华 刘宇恒 崔婷婷 王燕 邓冬梅 张惠芳 

机构地区：[1]Department of Physics,Shanghai University

出　　处：《Chinese Optics Letters》2011年第1期5-8,共4页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China under Grant Nos.60908006,10804067,and 60407007

摘　　要：In accordance with nonperturbative quantum scattering theory, we investigate photoelectron angular distri- butions （PADs） from above-threshold detachment （ATD） of negative ions irradiated by circularly polarized few-cycle laser fields. Electrons ejected on the polarization plane demonstrate distinct anisotropies in an- gular distributions which distinctly vary with the carrier-envelope （CE） phase. The anisotropy is caused by interference between transition channels; it also depends strongly on laser frequency, pulse duration, and kinetic energy of photoelectrons. Optimal emission of photoelectrons, which varies with CE phase, makes it possible to control photoelectron motion.In accordance with nonperturbative quantum scattering theory, we investigate photoelectron angular distri- butions （PADs） from above-threshold detachment （ATD） of negative ions irradiated by circularly polarized few-cycle laser fields. Electrons ejected on the polarization plane demonstrate distinct anisotropies in an- gular distributions which distinctly vary with the carrier-envelope （CE） phase. The anisotropy is caused by interference between transition channels; it also depends strongly on laser frequency, pulse duration, and kinetic energy of photoelectrons. Optimal emission of photoelectrons, which varies with CE phase, makes it possible to control photoelectron motion.

关 键 词：Angular distribution ANISOTROPY ELECTRONS High energy physics Negative ions PHOTONS 

分 类 号：TN241[电子电信—物理电子学]