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We present the extension of the time-dependent configuration interactionsingles (TDCIS) method to the computation of the electron kinetic-energyspectrum in photoionization processes. Especially for strong and long ionizinglight pulses the detection of the photoelectron poses a computational challengebecause propagating the outgoing photoelectron wavepacket requires large gridsizes. Two different methods which allow for the extraction of the asymptoticphotoelectron momentum are compared regarding their methodological andcomputational performance. The first method follows the scheme of Tong et al.\cite{tong} where the photoelectron wavefunction is absorbed by a realsplitting function. The second method after Tao and Scrinzi \cite{scrinzi}measures the flux of the electron wavepacket through a surface at a fixedradius. With both methods the full angle- and energy-resolved photoelectronspectrum is obtained. Combined with the TDCIS scheme it is possible to analyzethe dynamics of the outgoing electron in a channel-resolved way and,additionally, to study the dynamics of the bound electrons in the parent ion.As an application, one-photon and above-threshold ionization (ATI) of argonfollowing strong XUV irradiation are studied via energy- and angle-resolvedphotoelectron spectra.

Calculation of photoelectron spectra within the time-dependent configuration interaction singles scheme