Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 21: Interaction with strong or short laser pulses

A 21.15: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

Photoelectrons and light from laser-driven 1D helium using TDRNOT — •Martins Brics, Julius Rapp, Adrian Hanusch, and Dieter Bauer — Institut für Physik, Universität Rostock, 18051 Rostock, Germany

Time-dependent renormalized-natural-orbital theory (TDRNOT) is a promising approach to describe correlated electron quantum dynamics, even beyond linear response. It has been shown in [1] that TDRNOT with only two renormalized natural orbitals (RNOs) per spin is capable of describing correlated phenomena such as doubly excited states, autoionization, and Fano profiles in photoelectron spectra for He. Here we go one step further and investigate the performance of TDRNOT for processes which involve more than two RNOs. As test cases we consider nonsequential double ionization and single photon double ionization. Both are strongly correlated processes and therefore many RNOs are needed to describe them. Our main observable for this purpose is correlated photoelectron spectra. The other aspect we look at is what advantages offers TDRNOT over time-dependent density function theory (TDDFT) for cases where TDDFT already gives quite good results. For that purpose we test TDRNOT on high-order harmonic spectra.

[1] M. Brics, D. Bauer, Phys. Rev. A 88, 052514 (2013).