Ultrafast Two-Electron Orbital Swap in Li Initiated by Attosecond Pulses  

作　　者：Hui Jjang Zhao-Han Zhang Yang Li Camilo Ruiz Feng He 

机构地区：[1]Key Laboratory for Laser Plasmas(Ministry of Education)and School of Physics and Astronomy,Collaborative Innovation Center for IFSA(CICIFSA),Shanghai Jiao Tong University,Shanghai 200240,China [2]Instituto Universitario de Física Fundamental y Matemáticas,Universidad de Salamanca,Plaza de la Merced s/n,37008 Salamanca,Spain [3]CAS Center for Excellence in Ultra-intense Laser Science,Shanghai 201800,China

出　　处：《Ultrafast Science》2023年第4期15-23,共9页超快科学（英文）

基　　金：supported by the National Natural Science Foundation of China(NSFC)(Grant No.11925405 and No.12274294);the National Key R&D Program of China(2018YFA0404802)。

摘　　要：A universal mechanism of ultrafast 2-electron orbital swap is discovered through 2-photon sequential double ionization of Li.After a 1s electron in Li is ionized by absorbing an extreme ultraviolet photon,the other 2 bound electrons located on 2 different shells have either parallel or antiparallel spin orientations.In the latter case,these 2 electrons are in the superposition of the singlet and triplet states with different energies,forming a quantum beat and giving rise to the 2-electron orbital swap with a period of several hundred attoseconds.The orbital swap mechanism can be used to manipulate the spin polarization of photoelectron pairs by conceiving the attosecond-pump attosecond-probe strategy and thus serves as a knob to control spin-resolved multielectron ultrafast dynamics.

关 键 词：orbital swap quantum beat spin polarization of photoelectron pairs spin-resolved 

分 类 号：O43[机械工程—光学工程]