Heidelberg 2015 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 3: Femtosecond Spectroscopy 1
MO 3.5: Vortrag
Montag, 23. März 2015, 15:45–16:00, PH/HS1
Chiral Distinction via Femtosecond Mass Spectrometry with a Twin Peak Ion Source — Christian Lux1, •Tom Ring1, Stefanie Züllighoven1, Alexander Kastner1, Cristian Sarpe1, Arne Senftleben1, Matthias Wollenhaupt2, and Thomas Baumert1 — 1Universität Kassel, Institut für Physik und CINSaT, D-34132 Kassel — 2Carl von Ossietzky Universität Oldenburg, Institut für Physik, D-26129 Oldenburg
Circular dichroism (CD) in laser mass spectrometry gives access to the distinction of chiral molecules in the gas phase [1,2]. A twin mass peak setup allows circumventing shot-to-shot fluctuations in laser pulse intensity, gas density or ion detection. Two foci with a small spatial displacement result in time-separated mass spectra. A change in helicity from focus to focus implements a self-referencing system. Using nanosecond laser pulses a back reflecting setup [3] provides the desired characteristics. Due to optical dispersion, this does not work with ultra-short laser pulses. Hence, we introduced an in-line setup applicable for femtosecond laser pulses. In this contribution, we show the advantages of the new optical setup and present our first results of mass-selective chiral analysis via time of flight mass spectrometry.
Titze, Zollitsch, Heiz, Boesl: ChemPhysChem 2014, 15, 2762-2767
Horsch, Urbasch, Weitzel: Chirality 2012, 24, 684-690
Logé, Boesl: ChemPhysChem 2011, 12, 1940-1947