Ab-initio validation of a simple heuristic expression for the sequential-double-ionization contribution to the double ionization of helium by ultrashort XUV pulses - Liu, A.; Thumm, Uwe P. E. (My University, 2015)
Citation: Liu, A., & Thumm, U. (2015). Ab-initio validation of a simple heuristic expression for the sequential-double-ionization contribution to the double ionization of helium by ultrashort XUV pulses. 635(9). doi:10.1088/1742-6596/635/9/092039
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 (? > 54.4 eV) and non-sequential (39.5 eV < ? < 54.4 eV) double-ionization regimes. © Published under licence by IOP Publishing Ltd.
Keywords: Atoms; Helium; Ionization; Laser Pulses; Nonlinear Equations; Photoelectron Spectroscopy