5 years ago

Observation of Enhanced Chiral Asymmetries in the Inner-Shell Photoionization of Uniaxially Oriented Methyloxirane Enantiomers

Observation of Enhanced Chiral Asymmetries in the Inner-Shell Photoionization of Uniaxially Oriented Methyloxirane Enantiomers
Daniel Metz, Andreas Kuhlins, André Knie, Markus Schöffler, Philipp V. Demekhin, Horst Schmidt-Böcking, Janine Gatzke, Tobias Bauer, Kevin Henrichs, Maurice Tia, Arno Ehresmann, Natascha Wechselberger, Stefan Zeller, Alexander Hartung, Max Kircher, Jonathan Neff, Anne D. Müller, Joshua B. Williams, Juliane Siebert, Florian Wiegandt, Reinhard Dörner, Kiyoshi Ueda, Florian Trinter, Jonas Rist, Martin Pitzer, Hironobu Fukuzawa, Andreas Hans, Markus Waitz, Lothar Ph. H. Schmidt, Phillip Burzynski, Daniel Trabert, Till Jahnke, Helena Gassert, Gregor Kastirke, Miriam Weller, Jasper Becht, Robert Berger, Carl Schober, Robert Wallauer, Ltaief Ben Ltaief, Hong-Keun Kim
Most large molecules are chiral in their structure: they exist as two enantiomers, which are mirror images of each other. Whereas the rovibronic sublevels of two enantiomers are almost identical (neglecting a minuscular effect of the weak interaction), it turns out that the photoelectric effect is sensitive to the absolute configuration of the ionized enantiomer. Indeed, photoionization of randomly oriented enantiomers by left or right circularly polarized light results in a slightly different electron flux parallel or antiparallel with respect to the photon propagation direction—an effect termed photoelectron circular dichroism (PECD). Our comprehensive study demonstrates that the origin of PECD can be found in the molecular frame electron emission pattern connecting PECD to other fundamental photophysical effects such as the circular dichroism in angular distributions (CDAD). Accordingly, distinct spatial orientations of a chiral molecule enhance the PECD by a factor of about 10.

Publisher URL: http://dx.doi.org/10.1021/acs.jpclett.7b01000

DOI: 10.1021/acs.jpclett.7b01000

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