Imprint of transient electron localization in H2+ using circularly-polarized laser pulse  

作　　者：Jianghua Luo Jun Li Huafeng Zhang 罗江华;李军;张华峰(School of Physics and Optoelectronic Engineering,Yangtze University,Jingzhou 434023,China;National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China)

机构地区：[1]School of Physics and Optoelectronic Engineering,Yangtze University,Jingzhou 434023,China [2]National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China

出　　处：《Chinese Physics B》2020年第12期221-226,共6页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2018YFB1801904);the National Natural Science Foundation of China(Grant No.12075036);the Open Research Fund of National Mobile Communications Research Laboratory,Southeast University(Grant No.2019D14)。

摘　　要：Photoelectron momentum distribution of hydrogen molecular ion in a circularly polarized laser pulse is calculated by solving the three-dimensional time-dependent Schrodinger equation(3D-TDSE).At the intermediate internuclear distance,an unusual multi-peak structure is observed in the angular distribution,which is proved to be a signature of the transient localization of the electron upon alternating nucleus.By tracing the time-dependent ionization rate and bound state populations,we provide a clear evidence that the transient electron localization still exists in circularly polarized pulse and the corresponding multiple ionization bursts are directly mapped onto observable angular distributions.In addition,we introduce an intuitive strong-field approximation model which incorporates laser-induced subcycle internal electron dynamics to isolate the effect of the Coulomb potential of the parent ions.In this way,the timing of each ionization burst can be directly read out from the angular distributions.Our results suggest that the ionization time serves as a sensitive tool encoding intramolecular electron dynamics and can be measured using attoclock technique.

关 键 词：strong-field ionization ultrafast phenomena photoelectron spectrum 

分 类 号：TN24[电子电信—物理电子学] O436.3[机械工程—光学工程]