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DPG

Hamburg 2009 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 34: Poster II

A 34.36: Poster

Donnerstag, 5. März 2009, 16:30–19:00, VMP 9 Poster

Selective excitation of multiple states in atomic sodium by a single chirped femtosecond laser pulseMarc Krug1, Svetoslav Ivanov2, Matthias Wollenhaupt1, Tim Bayer1, •Christian Lux1, Nikolay V. Vitanov2, and Thomas Baumert11Universität Kassel, Institut für Physik und Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), Heinrich-Plett-Str. 40, D-34132 Kassel, Germany — 2Theoretical Physics Division - Department of Physics, Sofia University - James Bourchier 5 blvd, 1164 Sofia, Bulgaria

Chirped femtosecond laser pulses generated by spectral phase modulation are used for strong-field Resonance Enhanced Multi-Photon Ionization (REMPI) of atomic sodium. Photoelectron Angular Distributions (PADs) are measured employing a photoelectron imaging spectrometer. Pronounced differences in the PADs with respect to the sign of the chirp (up-chirp/down-chirp) are observed experimentally. We identify three contributing ionization processes, i.e. a (2+1+1) REMPI, a (3+1) REMPI and ionization via the off-resonant 3p-state. The experimental data is supported by full quantum mechanical simulations of the excitation/ionization process. An analytical model to describe the (2+1+1) excitation channel and the selective excitation of multiple states is presented in addition.

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