787 citations · 2k across the 24 of their papers we have counts for
4 papers · 1 filter
High-order finite element method for atomic structure calculations
Ondřej Čertík, John E. Pask, Isuru Fernando +5
We introduce \texttt{featom}, an open source code that implements a high-order finite element solver for the radial Schrödinger, Dirac, and Kohn-Sham equations. The formulation acc…
Universal features in sequential and nonsequential two-photon double ionization of helium
R. Pazourek, J. Feist, S. Nagele +4
We analyze two-photon double ionization of helium in both the nonsequential and sequential regime. We show that the energy spacing between the two emitted electrons provides the ke…
Probing Electron Correlation via Attosecond XUV Pulses in the Two-Photon Double Ionization of Helium
J. Feist, S. Nagele, R. Pazourek +4
Recent experimental developments of high-intensity, short-pulse XUV light sources are enhancing our ability to study electron-electron correlations. We perform time-dependent calcu…
Nonsequential two-photon double ionization of helium
J. Feist, S. Nagele, R. Pazourek +4
We present accurate time-dependent ab initio calculations on fully differential and total integrated (generalized) cross sections for the nonsequential two-photon double ionization…