Asymmetry of Photoelectron Angular Distributions in Molecules by Intense Attosecond Extreme Ultraviolet Laser Pulses  

强阿秒XUV激走脉冲下H2^＋分子光电子能谱角分布非对称性

作　　者：于华明[1] 元凯军 孙志刚[3] 

机构地区：[1]辽宁石油化工大学理学院,抚顺130001 [2]加拿大谢布克大学,魁北克J1K2R1 [3]中国科学院大连化学物理研究所,大连116023

出　　处：《Chinese Journal of Chemical Physics》2014年第6期647-652,I0003,共7页化学物理学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China （No.21222308, No.21103187, and No.21133006）, the Chinese Academy of Sciences, and the National Basic Research Program of China （No. 2013CB922200）.

摘　　要：We present photoelectron angular distribution of the aligned molecular ion H2^＋ by intense ultrashort attosecond extreme ultraviolet laser pulses from numerical solutions of timedependent Schrodinger equations. Photoionization from a superposition state of the ground 1sσg and the excited 2pσu states with pulses at photon energies above the ionization potential, hω〉Ip, and intensity 10^14 W/cm^2, yields pulse duration dependent asymmetry of photoelectron angular distributions. We attribute the asymmetry to the periodical oscillation of the coherent electron wave packets, resulting from the interference of the two electronic states. For the processes with long pulse durations, such duration dependence is absent and symmetric angular distributions are obtained.

关 键 词：Attosecond photoionization Coherent electron wave packet Photoelectron angular distribution 

分 类 号：O[理学]