| Title | Probing the Spin-Orbit Time Delay of Multiphoton Ionization of Kr by Bicircular Fields |
| Authors | Ge, Peipei Fang, Yiqi Guo, Zhenning Ma, Xueyan Yu, Xiaoyang Han, Meng Wu, Chengyin Gong, Qihuang Liu, Yunquan |
| Affiliation | Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China Peking Univ, Frontiers Sci Ctr Nanooptoelect, Sch Phys, Beijing 100871, Peoples R China Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Shanxi, Peoples R China Peking Univ, Ctr Appl Phys & Technol, HEDPS, Beijing 100871, Peoples R China |
| Keywords | POLARIZATION |
| Issue Date | 4-Jun-2021 |
| Publisher | PHYSICAL REVIEW LETTERS |
| Abstract | We study multiphoton ionization of Kr atoms by circular 400-nm laser fields and probe its photoelectron circular dichroism with the weak corotating and counterrotating circular fields at 800 nm. The unusual momentum- and energy-resolved photoelectron circular dichroisms from the P-2(1/2) ionic state are observed as compared with those from P-2(3/2) ionic state. We identify an anomalous ionization enhancement at sidebands related to the P-2(1/2) ionic state on photoelectron momentum distribution when switching the relative helicity of the two fields from corotating to counterrotating. By performing the two-color intensitycontinuously-varying experiments and the pump- probe experiment, we find a specific mixed-photon populated resonant transition channel in counterrotating fields that contributes to the ionization enhancement. We then probe the time delay between the two spin-orbit coupled ionic states (P-2(1/2) and P-2(3/2)) using bicircular fields and reveal that the resonant transition has an insignificant effect on the relative spin-orbit time delay. |
| URI | http://hdl.handle.net/20.500.11897/617835 |
| ISSN | 0031-9007 |
| DOI | 10.1103/PhysRevLett.126.223001 |
| Indexed | EI SCI(E) |
| Appears in Collections: | 物理学院 人工微结构和介观物理国家重点实验室 工学院 |
