Two-photon double ionization of helium by chirped few-cycle attosecond pulses:From nonsequential to sequential regime  

作　　者：童瑶 姜维超 伍攀 彭良友 

机构地区：[1]State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter,School of Physics,Peking University [2]Institute for Theoretical Physics,Vienna University of Technology [3]Collaborative Innovation Center of Extreme Optics,Shanxi University

出　　处：《Chinese Physics B》2016年第7期196-203,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11322437 and 11574010);the National Basic Research Project of China(Grant No.2013CB922402)

摘　　要：The two-photon double ionization（TPDI） dynamics of helium by chirped attosecond pulses are theoretically studied by solving the two-electron time-dependent Schr o¨dinger equation in its full dimensions. We show that both the differential and the total double ionization probability can be significantly controlled by adjusting the chirp. The dependence of the TPDI on the chirp can be quite different for different photon energies, relying on the central photon energy being in the sequential region, nonsequential region, or translation region. The physics which lead to the chirp dependence for different photon energies are addressed. Present findings are well reproduced by a model based on the second-order time-dependent perturbation theory.The two-photon double ionization（TPDI） dynamics of helium by chirped attosecond pulses are theoretically studied by solving the two-electron time-dependent Schr o¨dinger equation in its full dimensions. We show that both the differential and the total double ionization probability can be significantly controlled by adjusting the chirp. The dependence of the TPDI on the chirp can be quite different for different photon energies, relying on the central photon energy being in the sequential region, nonsequential region, or translation region. The physics which lead to the chirp dependence for different photon energies are addressed. Present findings are well reproduced by a model based on the second-order time-dependent perturbation theory.

关 键 词：time-dependent Schr?dinger equation(TDSE) double ionization electron correlation CHIRP 

分 类 号：O562.4[理学—原子与分子物理]