Coulomb focusing in attosecond angular streaking  

作　　者：Xiaokai Li Xiwang Liu Chuncheng Wang Shuai Ben Shengpeng Zhou Yizhang Yang Xiaohong Song Jing Chen Weifeng Yang Dajun Ding 

机构地区：[1]Institute of Atomic and Molecular Physics,and Advanced Light Field and Modern Medical Treatment Science and Technology Innovation Center of Jilin Province,Jilin University,Changchun 130012,China [2]School of Physics and Optoelectronic Engineering,Hainan University,Haikou 570228,China [3]Hefei National Laboratory,and Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences,University of Science and Technology of China,Hefei 230026,China [4]Center for Theoretical Physics,Hainan University,Haikou 570228,China

出　　处：《Light(Science & Applications)》2024年第11期2611-2619,共9页光（科学与应用)（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12134005,12374260,12074240,12004133,92261201,12274179 and 12204135);the National Basic Research Program of China(No.2019YFA0307700);Hainan Provincial Natural Science Foundation(Grant Nos.122CXTD504,123MS002 and 122QN217).

摘　　要：Angular streaking technique employs a close-to-circularly polarized laser pulse to build a mapping between the instant of maximum ionization and the most probable emission angle in the photoelectron momentum distribution,thereby enabling the probe of laser-induced electron dynamics in atoms and molecules with attosecond temporal resolution.Here,through the jointed experimental observations and improved Coulombcorrected strong-field approximation statistical simulations,we identify that electrons emitted at different initial ionization times converge to the most probable emission angle due to the previously-unexpected Coulomb focusing triggered by the nonadiabatic laser-induced electron tunneling.We reveal that the Coulomb focusing induces the observed nonintuitive energy-dependent trend in the angular streaking measurements on the nonadiabatic tunneling,and that tunneling dynamics under the classically forbidden barrier can leave fingerprints on the resulting signals.Our findings have significant implications for the decoding of the intricate tunneling dynamics with attosecond angular streaking.

关 键 词：ANGULAR TUNNELING thereby 

分 类 号：O436.3[机械工程—光学工程]