Bonn 2025 – scientific programme
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MO: Fachverband Molekülphysik
MO 1: Chirality
MO 1.4: Talk
Monday, March 10, 2025, 12:00–12:15, HS XVI
the study of photoelectron circular dichroism in the ionization of (R) - (-) -fenchone by femtosecond laser — •Wentao Chen1, Brendan Wouterlood1, Chie Nakayama2, Lukas Bruder1, Sebastian Hartweg1, Takamasa Momose2, and Frank Stienkemeier1 — 1Institute of Physics, University of Freiburg, 79104 Freiburg — 2University of British Columbia, Department of Chemistry, 2036 Main Mall, Vancouver BC, Canada
Photoelectron circular dichroism (PECD) is an intense chiroptical effect when chiral molecules are ionized by circularly-polarized light (CPL). It would show a forwards/backward asymmetry in photoelectron angular distribution with respect to the CPL propagation direction and be several orders of magnitude more intense than traditional circular dichroism (CD) methods. As it's high sensitivity, PECD could be a fine tool for chirality identification. Here we aim to study the time-resolved PECD effect of (R)-(-)-Fenchone in helium droplets. In the beginning, we used CPL 400nm laser to ionized the Fenchone which is seeded in helium beam and detected the photoelectron by velocity map imaging method. We detected a significant PECD effect after subtracting the signals ionized by CPL lasers at different helicity. Then we will apply linear-polarized 200nm pump laser and CPL 266nm probe laser together with helium droplets method to study the time-resolved PECD effect in (R)-(-)-Fenchone. This will help us to figure out how the helium-droplets environment influences the ultrafast relaxation dynamics in chiral systems.
Keywords: photoelectron circular dichroism; Fenchone