Ab-initio validation of a simple heuristic expression for the sequential-double-ionization contribution to the double ionization of helium by ultrashort XUV pulses

29th International Conference on Photonic, Electronic, and Atomic Collisions

Liu, Aihua^1 ; Thumm, Uwe^1

Department of Physics, Kansas State University, Manhattan

KS

66506, United States^1

关键词: Ab initio;    Double ionization;    Finite element-discrete variable representations;    Photoelectron angular distributions;    Time dependent Schrodinger equation;    Two-photon double ionization;    XUV pulse;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/9/092039/pdf
DOI  :  10.1088/1742-6596/635/9/092039

来源: IOP

【 摘 要 】

We study two-photon double ionization of helium by short XUV pulses by numerically solving the time-dependent Schrodinger equation in full dimensionality within a finite-element discrete-variable-representation scheme. Based on the emission asymmetries in joint photoelectron angular distributions, we identify sequential and non-sequential contributions to two-photon double ionization for ultrashort pulses whose spectrum overlaps the sequential (ω > 54.4 eV) and non-sequential (39.5 eV