Hannover 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MO: Fachverband Molekülphysik

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

MO 6.4: Poster

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

Sub-One Per Cent Enantiomeric Excess Sensitivity using Femtosecond Photoelectron Circular Dichroism — Alexander Kastner, Christian Lux, Tom Ring, •Stefanie Züllighoven, Cristian Sarpe, Arne Senftleben, and Thomas Baumert — University of Kassel, Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), Heinrich-Plett-Str. 40, D-34132 Kassel, Germany

Photoelectron circular dichroism (PECD) is investigated experimentally on chiral specimen with a varying amount of enantiomeric excess (e.e.). As a prototype we measure and analyze the photoelectron angular distribution from randomly oriented fenchone molecules in the gas phase resulting from ionization with circularly polarized femtosecond laser pulses. The quantification of these measurements shows a linear dependence with respect to e.e.. In addition, a distinction of differences in the e.e. (denoted as detection limit) below one per cent for nearly enantiopure samples as well as for almost racemates is demonstrated. In combination with a reference the assignment of absolute e.e. values is possible. The present measurement time is a few minutes but can be reduced further. This table-top laser-based approach facilitates a widespread implementation in chiral analysis.