Probing Molecular Frame Wigner Time Delay and Electron Wavepacket Phase Structure of CO Molecule  

作　　者：Zhenning Guo Peipei Ge Yiqi Fang Yankun Dou Xiaoyang Yu Jiguo Wang Qihuang Gong Yunquan Liu 

机构地区：[1]State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-Optoelectronics,School of Physics,Peking University,Beijing 100871,China [2]Collaborative Innovation Center of Quantum Matter,Beijing 100871,China [3]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan,Shanxi 030006,China

出　　处：《Ultrafast Science》2022年第2期19-28,共10页超快科学（英文）

基　　金：supported by the National Science Foundation of China(Grant Nos.92050201,11774013,11527901).

摘　　要：The time delay of photoelectron emission serves as a fundamental building block to understand the ultrafast electron emission dynamics in strong-field physics.Here,we study the photoelectron angular streaking of CO molecules by using two-color(400+800nm)corotating circularly polarized fields.By coincidently measuring photoelectrons with the dissociative ions,we present molecular frame photoelectron angular distributions with respect to the instantaneous driving electric field signatures.We develop a semiclassical nonadiabatic molecular quantum-trajectory Monte Carlo(MO-QTMC)model that fully captures the experimental observations and further ab initio simulations.We disentangle the orientation-resolved contribution of the anisotropic ionic potential and the molecular orbital structure on the measured photoelectron angular distributions.Furthermore,by analyzing the photoelectron interference patterns,we extract the sub-Coulomb-barrier phase distribution of the photoelectron wavepacket and reconstruct the orientation-and energy-resolved Wigner time delay in the molecular frame.Holographic angular streaking with bicircular fields can be used for probing polyatomic molecules in the future.

关 键 词：PHOTOELECTRON ANGULAR circular 

分 类 号：O56[理学—原子与分子物理]