Hannover 2016 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 6: Posters 1: Novelties in Molecular Physics: Femtosecond Spectroscopy

MO 6.5: Poster

Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof

Mass-selective Circular Dichroism after Femtosecond Laser Ionization — •Tom Ring, Alexander Kastner, Stefanie Züllighoven, Tobias Grabsch, Cristian Sarpe, Christian Lux, Arne Senftleben, and Thomas Baumert — Universität Kassel, Institut für Physik und CINSaT, D-34132 Kassel

Multi Photon Ionization grants access to Circular Dichroism (CD) with circularly polarized laser pulses. The analysis via time of flight mass spectra provides a mass-selective tool to distinguish chiral molecules in the gas phase.[1,2] Hence, mixtures of chiral molecules as well as CD effects on fragments can be investigated.

Introducing 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. The in-line optical setup allows to make use of femtosecond laser pulses, whose broad bandwidth promises new possibilities in chiral control. Besides the advantages of this setup we present first results on different chiral molecules.
Titze et al.: ChemPhysChem 2014, 15, 2762-2767
Horsch et al.: Chirality 2012, 24, 684-690