t-SURFF: Fully Differential Two-Electron Photo-Emission Spectra

TL;DR

This paper extends the t-SURFF method to calculate fully differential two-electron photo-emission spectra, revealing pulse-dependent effects in double ionization processes for atomic systems.

Contribution

It introduces an extension of the t-SURFF method for accurate simulation of double ionization spectra in two-electron systems under strong laser fields.

Findings

Pronounced dependence of shake-up and non-sequential double ionization on laser pulse phase and duration.

Efficient simulation volumes that only encompass the effective interaction range.

Discussion on extending the method to fully three-dimensional calculations.

Abstract

The time dependent surface flux (t-SURFF) method is extended to single and double ionization of two electron systems. Fully differential double emission spectra by strong pulses at extreme UV and infrared wave length are calculated using simulation volumes that only accommodate the effective range of the atomic binding potential and the quiver radius of free electrons in the external field. For a model system we find pronounced dependence of shake-up and non-sequential double ionization on phase and duration of the laser pulse. Extension to fully three-dimensional calculations is discussed.