Heidelberg 2015 – scientific programme

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MO: Fachverband Molekülphysik

MO 11: Posters 2: Novelties in Molecular Physics

MO 11.20: Poster

Tuesday, March 24, 2015, 17:00–19:00, C/Foyer

Gas Phase Studies of Chiral Carbonyls with Circular Dichroism - Resonance-enhanced Multiphoton Ionization (CD-REMPI) — •Jörn Lepelmeier, Katharina Titze, Aras Kartouzian, Ulrich Heiz, and Ulrich Boesl — Chair of Physical Chemistry & Catalysis Research Center, Technische Universität München, Germany

The Circular Dichroism - Resonance-enhanced Multiphoton Ionization (CD-REMPI) technique combines the enantiosensitivity of CD spectroscopy with the wavelength selectivity of REMPI by using circularly instead of linearly polarized light. In addition the usage of a Time Of Flight - Mass Spectrometer (TOF-MS) provides a mass separation of the ionized sample molecules. Thus, CD-REMPI enables a three dimensional discrimination for chiral molecules in the gas phase and reduces the sample preparation to a minimum. Therefore, it affords for example ideal attributes for the stereoselective catalysis which needs a fast and sensitive detection method for product molecules in vacuum directly after their reaction.

Our contribution should demonstrate the functionality of the CD-REMPI method with measurements of the asymmetry factor g of chiral carbonyls under varied conditions due to effusive or supersonic gas inlet and one- or two-color ionization [1][2].

[1] U. Boesl, A. Bornschlegl, C. Logé and K. Titze, Analytical and Bioanalytical Chemistry 405 (2013) 6913-6924

[2] K. Titze, T. Zollitsch, U. Heiz and U. Boesl, ChemPhysChem 15 (2014) 2762-2767