Mainz 2026 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 13: Poster – Ultrafast Electronic Dynamics

MO 13.6: Poster

Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG

Circular dichroism yield measurements using a magnetic bottle electron spectrometer with twin-focus detection scheme — •Alexander Gerlach, Steffen Leinberger, Horst Rottke, Sagnik Das, Hendrike Braun, and Jochen Mikosch — Institut für Physik, Universität Kassel, Kassel, Germany

We employ time-of-flight (TOF) spectroscopy with a magnetic bottle to explore the circular dichroism (CD) of chiral molecules in the gas phase. Measuring the energy resolved electron yield for right- and left-circularly polarized light with femtosecond UV pulses allows to distinguish the excitation channels for enantiomeric molecular species.

For this purpose we use a modified twin-focus detection scheme [1], which separates the interaction regions of the two polarization states perpendicular to the TOF axis. An MCP delay-line detector is used to obtain the time and spatial distribution of the emitted photoelectrons from the investigated chiral molecule. First test measurements with this newly assembled electron spectrometer are presented, complementing the established CD ion yield measurements [1] for these systems.

[1] T. Ring et al., Rev. Sci. Instrum. 92, 033001 (2021)

Keywords: circular dichroism electron yield; magnetic bottle electron spectrometer; time-of-flight measurements