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MO: Fachverband Molekülphysik

MO 8: MO Poster 2

MO 8.8: Poster

Dienstag, 10. März 2020, 17:00–19:00, Empore Lichthof

Towards fs UV Measurements of Mass Selective Circular Dichroism in the Gas Phase — •Constantin Witte, Tom Ring, Nicolas Ladda, Alexander Kastner, Simon Ranecky, Sudheendran Vasudevan, Han-gyeol Lee, Christian Sarpe, Hendrike Braun, Arne Senftleben, and Thomas Baumert — Institut für Physik, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany

The difference in absorption of left and right circularly polarized light is defined as Circular Dichroism (CD). Due to the ubiquity of chirality, its analysis is of great importance. Here, we attempt to measure the CD in the gas phase in the ion yield of chiral showcase molecules camphor and fenchone that have been ionized using a femtosecond laser system. Mass selectivity is achieved via a Time of Flight Mass Spectrometer in Wiley-McLaren Configuration. Generating the third harmonic of our Ti:Sa laser system at 266 nm allows us to reach the n→ π^* transition in ketones which promises a high CD according to ns measurements [1]. Generally, a lot of chiral molecules have their absorption bands in the UV. Accessing these with a single photon is beneficial for reaching higher, energetically closer lying states. In the future, this set-up is to be used to investigate and enhance CD effects, determine enantiomeric excess and potentially for enantiomeric purification using coherent control techniques.

[1] Logé, C., Boesl, U.; Multiphoton Ionization and Circular Dichroism: New Experimental Approach and Application to Natural Products, Chem. Phys. Chem. 12, 2011, 1940-1947