Freiburg 2024 – scientific programme

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MO: Fachverband Molekülphysik

MO 23: Poster: Chirality

MO 23.2: Poster

Thursday, March 14, 2024, 17:00–19:00, Tent C

Intensity dependence of PECD using near-ultraviolet femtosecond laser pulses — •Sudheendran Vasudevan, Han-gyeol Lee, Eric Kutscher, Simon T. Ranecky, Nicolas Ladda, Tonio Rosen, Sagnik Das, Till Stehling, Jayanta Ghosh, Anton N. Artemyev, Hendrike Braun, Arne Senftleben, Philipp V. Demekhin, and Thomas Baumert — Institut für Physik, Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel

Exploiting an electric dipole effect in ionization, photoelectron circular dichroism (PECD), i.e., an asymmetry in the photoelectron angular distribution along the light propagation, is a highly sensitive enantioselective spectroscopy for studying chiral molecules in the gas phase using either single-photon [1] or multiphoton ionization [2]. In the latter case, resonance-enhanced multiphoton ionization (REMPI) gives access to intermediate electronic states [3]. The PECD sensitivity opens the door to study control of the coupled electron and nuclear motion in enantiomers. A prerequisite is the detailed understanding of PECD in REMPI schemes. In this contribution, we demonstrate the intensity-dependence of PECD on fenchone via 2+1 REMPI using 30 fs near-ultraviolet laser pulses centered at 396 nm. We find that the magnitude of LPECD decreases with the linear increase in the FWHM of the photoelectron spectra.

References

[1] Böwering, N. et al. Phys. Rev. Lett. 86, 1187 (2001).

[2] Lux, C. et al. Angew. Chem. Int. Ed. 51, 5001*5005 (2012).

[3] Lee, H.-g. et al. PCCP 24, 27483*27494 (2022).

Keywords: Photoelectron Spectroscopy; Light-Matter Interaction; Chirality; Circular Dichroism; Chiroptical spectroscopy