Mainz 2026 – scientific programme

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MO: Fachverband Molekülphysik

MO 11: Poster – Chirality

MO 11.8: Poster

Tuesday, March 3, 2026, 17:00–19:00, Philo 1. OG

Towards Photoelectron Circular Dichroism in the photodetachment from fenchone derived anions — •Viktoria Katharina Brandt, Kun Duan, André Fielicke, and Gerard Meijer — Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany

Photoelectron Circular Dichroism (PECD) is a chiral optical effect that manifests in the angle-dependent photoemission of an electron upon irradiation of a chiral molecule by circularly polarized light. The use of anions in PECD studies allows for pre-photodetachment mass selectivity and eliminates the need for X-ray based ionization sources or multiphoton ionization schemes. The use of anions also enables studies of PECD under conditions of photodetachment, a photoemission regime that has historically been understudied. Fenchone and its derivates have been extensively investigated using PECD, due to its rigid bicyclic structure, which limits the presence of additional isomers, as well as its non-toxicity and high availability. We present first steps in the study of PECD of fenchone derived anions. These anions are created in a plasma entrainment source where fenchone (FenH) reacts with hydride and hydroxide to form anions of three different masses, fenchone −H⁺ (Fen⁻), fenchone +H⁻ (FenHH⁻) as well as fenchone +OH⁻ (FenHOH⁻). The PECD and potential structures of these anions are presented.

Keywords: Photoelectron Circular Dichroism (PECD); Anion Photoelectron Spectroscopy; Anion Photoelectron Circular Dichroism (PECD); Plasma Entrainment Source; Fenchone