SAMOP 2021 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 3: Chirality

MO 3.3: Vortrag

Dienstag, 21. September 2021, 11:30–11:45, H3

Coincident measurement of photoion circular dichroism and photoelectron circular dichroism of Propylene Oxide and 1-Phenyl-Ethylamine — •Carl Stefan Lehmann and Karl-Michael Weitzel — Philipps-Universität Marburg, Chemistry Department

Two methods for chirality analysis based on circular dichroism in laser ionization have gathered attention in recent years: photo-ion circular dichroism (PICD) and photo-electron circular dichroism (PECD). In PICD, a difference in total ion yields upon multiphoton ionization with circular polarized light is measured [1,2], whereas in PECD, the circular dichroism is observed in the angular distribution of the photoelectrons [3,4]. However, PICD and PECD rely on different selection rules and until recently no experiments have been reported in which both effects have been observed simultaneous. Here, we report the first coincident measurement of the PICD and PECD effects. A home-built photoion photoelectron coincidence spectrometer has been used to measure both the PICD and the PECD effects simultaneously employing a high repletion fs-laser system. As examples fs-PICD-PECD coincidence results are presented for parent and fragment ions of R- and S-methyloxirane [5] and R- and S- 1-Phenyl-Ethylamine [6].

[1] U. Boesl, A. Bornschlegl, ChemPhysChem, 2006, 7, 2085-2087. [2] P. Horsch, et al., PCCP, 2011, 13, 2378-2386. [3] C.S. Lehmann, et al., J. Chem. Phys., 2013, 139, 234307. [4] C. Lux, et al., Angew Chem Int Ed, 2012, 51, 5001*50054. [5] C.S. Lehmann, K.-M. Weitzel, PCCP, 22, 13707, (2020) [6] C.S. Lehmann, K.-M. Weitzel, to be published