Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 21: Interaction with strong or short laser pulses
A 21.1: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
Dynamic interference in the photoionization of helium by coherent intense high-frequency pulses — •Anne D. Müller1, Anton N. Artemyev1, David Hochstuhl2, Lorenz S. Cederbaum3, and Philipp V. Demekhin1 — 1Institut für Physik, Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel — 2Institut für Theoretische Physik und Astrophysik, Leibnizstrasse 15, 24098 Kiel — 3Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, INF 229, 69120 Heidelberg
The direct ionization of the helium atom by intense coherent high-frequency laser pulses is investigated theoretically from first principles. To this end, we solve numerically the time-dependent Schrödinger equation for the two-electron wave-packets by the efficient time-dependent restricted-active-space configuration-interaction method (TD-RASCI, [1]). Thereby we investigate how the dynamic interference of the photoelectrons of the same kinetic energy emitted at different times along the pulse [2] is modified for systems with several electrons. In particular, we consider photon energies which are nearly resonant for the subsequent 1s–2p excitation in the He+. In order to enable observations of the dynamic interference patterns in the computed photoionization spectrum, the two-electron wave-packets were propagated on large spatial grids over long times.
References.
[1] D. Hochstuhl, M. Bonitz, Phys. Rev. A, 053424 (2012).
[2] Ph.V. Demekhin, L.S. Cederbaum, Phys. Rev. Lett., 253001 (2012).