Berlin 2014 – scientific programme
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MO: Fachverband Molekülphysik
MO 10: Posters 2: Biomolecules, Energy Transfer, Clusters, Quantum Chemistry, Molecular Dynamics and Chirality
MO 10.25: Poster
Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais
Twin Mass Peak Ion Source for Determination of Chiral Enantiomers with Femtosecond Laser Pulses — Christian Lux1, •Tom Ring1, Stefanie Züllighoven1, Jens Köhler1, Cristian Sarpe1, Matthias Wollenhaupt2, and Thomas Baumert1 — 1Universität Kassel, Institut für Physik und CINSaT, D–34132 Kassel, Germany — 2Carl von Ossietzky Universität Oldenburg, Institut für Physik, D–26129 Oldenburg, Germany
In the recent past, a specific anisotropy was observed in the gas phase ionization of chiral enantiomers using circularly polarized laser pulses [1,2]. The implementation of a twin mass peak ion source enabled the direct determination of this anisotropy applying nanosecond laser pulses [1]: A focused circularly polarized laser beam passes a second lens, is back-reflected via a mirror and with changed helicity again focussed into the time-of-flight mass spectrometer. A small spatial displacement of both foci results in time-separated mass spectra. Fluctuations in the shot-to-shot laser pulse energy, the gas density or the ion detection can be circumvented. However, this technique is not suitable for femtosecond laser pulses which are strongly affected by optical
dispersion. In this contribution we discuss the current status of an in-line optical setup applicable for femtosecond laser pulses.
[1] C. Logé, U. Boesl, Chem. Phys. Chem. 12, 1940-1947 (2011)
[2] P. Horsch, G. Urbasch, K.-M. Weitzel, Chirality 24, 684-690 (2012)