Kiel 2011 – wissenschaftliches Programm

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SYCP: Symposium Charged particles in ultra-short fields

SYCP 1: Charged particles in ultra-fast fields

SYCP 1.4: Hauptvortrag

Donnerstag, 31. März 2011, 16:00–16:30, HS D

Correlated and ultrafast electron dynamics (in atoms and molecules) excited by UV radiation — •Karsten Balzer, Sebastian Bauch, David Hochstuhl, and Michael Bonitz — Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität Kiel, 24098 Kiel, Germany

New sub-femtosecond light sources such as free electron lasers (FELs) and elaborate table-top setups based on higher harmonic generation give access to the interesting wavelength regime from ultraviolet (UV) light towards x-rays at high coherence. This radiation can trigger intra-atomic transitions and processes on attosecond time-scales [1], and, hence, provides a tool to observe, explore and control electron dynamics in atoms, molecules or surfaces in real-time with increasing precision [2]. Moreover, even intra-atomic electron collisions are expected to be resolvable [3].

As the system's response to such fields is ultrafast and involves electron-electron correlation effects, highly accurate modeling is required from the theoretical perspective, and, to understand current and future experiments, the multi-electron dynamics need to be simulated at attosecond time-resolution.

In this talk, we discuss complementary methods and their limitations for describing ultrafast atomic-scale motion of electrons: The direct solution of the time-dependent Schrödinger equation (TDSE), the multiconfguration time-dependent Hartree-Fock (MCTDHF) method and the application of nonequilibrium Green function (NEGF) techniques. Thereby, we focus on the governing role of correlations in systems ranging from correlated model atoms and molecules to realistic atomic systems. In particular, we report on the ionization dynamics in attosecond XUV-infrared pump-probe experiments [4], on the two-photon ionization of Helium in the direct regime [5] and the correlated UV excitation dynamics in models for Helium, Hydrogen and Lithiumhydride [6].

[1] F. Krausz and M. Ivanov, Rev. Mod. Phys. 81, 163 (2009). [2] M. Drescher, M. Hentschel, R. Kienberger, M. Uiberacker, V. Yakovlev, A. Scrinzi, Th. Westerwalbesloh, U. Kleineberg, U. Heinzmann, and F. Krausz, Nature 419, 803 (2002). [3] A. Emmanouilidou, A. Staudte, P. B. Corkum, New J. Phys. 12, 103024 (2010). [4] S. Bauch, K. Balzer and M. Bonitz, Europhys. Lett. 91, 53001 (2010). [5] D. Hochstuhl and M. Bonitz, submitted to J. Chem. Phys. (2010), [arXiv:1010.5422] [6] K. Balzer, S. Bauch and M. Bonitz, Phys. Rev. A 81, 022510 (2010); ibid. 82, 033427 (2010).