Hannover 2016 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 14: Posters 3: Novelties in Molecular Physics: Theory of Molecular Dynamics, Collisions and Energy Transfer, and Experimental Techniques

MO 14.14: Poster

Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof

Investigation of 1-Phenylethanol with Circular Dichroism - Resonance-enhanced Multiphoton Ionization (CD-REMPI) in the Gas Phase — •Jörn Lepelmeier, Aras Kartouzian, Ulrich Boesl, and Ulrich Heiz — Lehrstuhl für Physikalische Chemie, Technische Universität München, Germany

The Circular Dichroism - Resonance-enhanced Multiphoton Ioniztion (CD-REMPI) provides a three dimensional discrimination methode for the investigation of chiral molecules in the gas phase. Beside the already two dimensional combinition of mass selectivity given by a Time Of Flight - Mass Spectrometer (TOF-MS) together with wavelength selectivity due to Resonance-enhanced Multiphoton Ionization (REMPI), an enantioselective component is added by utilizing the Circular Dichroism (CD) effect. Therefore, within the REMPI process the resonance excitation of the studied molecules is initialized by circularly instead of linearly polarized light. Thus, CD-REMPI allows fast enantiosensitive gas phase studies of chiral molecules without the requirement of previous sample preparation. These are ideal conditions e.g. for the detection of product species coming from stereoselective catalysis reactions.

With our contribution we want to demonstrate the sensitivity of the CD-REMPI technique with enantiomeric ecxess measurements regarding the asymmetry factor g of 1-Phenylethanol by using the Twin-Peak methode [1].

[1] C. Logé and U. Boesl, ChemPhysChem, 12 (2011) 1940-1947