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SAMOP 2021 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 7: Poster 1

MO 7.7: Poster

Donnerstag, 23. September 2021, 17:30–19:30, P

Photoelectron circular dichroism of heavier chalcogenofenchones using near-ultraviolet femtosecond laser pulses — •Sudheendran Vasudevan1, Manjinder Kour2, Simon.T. Ranecky1, Sagnik Das1, Jayanta Ghosh1, Denis Kargin1, Nicolas Ladda1, Hangyeol Lee1, Tonio Rosen1, Igor Vindanovic1, Thomas Baumert1, Robert Berger2, Hendrike Braun1, Thomas.F. Giesen1, Rudolf Pietschnig1, and Arne Senftleben11Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany — 2Philipps Universität Marburg, Hans-Meerwein Str.4, 35032 Marburg, Germany

Photoelectron spectra and photoelectron circular dichroism (PECD) measurements after femtosecond laser resonance enhanced multi-photon ionization (2+1 REMPI) are reported for chalcogenofenchones with variation of the chalcogen atom from oxygen to sulfur and selenium. Short pulses allow for excitation and ionization of the intermediate states out of an almost frozen nuclear configuration and reduce the influence of internal conversion processes. Keeping the excitation wavelength fixed, the contributing resonances and ionization energies are tuned in a bathochromic fashion by chemical substitution of heavier atoms. Intermediate electronic states excited during the REMPI process are assigned based on the measured photoelectron spectra and ab initio quantum chemical calculations. The bathochromic shifts cause the heavier chalcogenofenchones to have absorption in the visible region, which opens the door for future laser excitation, and control studies on the important fenchone prototype.

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