Mainz 2026 – scientific programme
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MO: Fachverband Molekülphysik
MO 11: Poster – Chirality
MO 11.4: Poster
Tuesday, March 3, 2026, 17:00–19:00, Philo 1. OG
Towards Circular Dichroism in Ion Yield and Electron Kinetic Energy on 3-Methylcyclopentanone — •Liliana M. Ramos Moreno1, Deepak K. Pandey1, Sagnik Das1, Claus-Peter Schulz2, Hendrike Braun-Knie1, and Jochen Mikosch1 — 1Institut für Physik, Universität Kassel, Heinrich Plett Str. 40, 34132 Kassel, Germany — 2Max Born Institute, Max-Born-Straße 2A, 12489 Berlin, Germany
The cyclic ketone 3-methyl cyclopentanone (3-MCP) is well-known for a strong Circular Dichroism in Ion Yield (CDIY) effect in resonance enhanced multiphoton ionization via the π* ← n transition. Coherent control of CDIY in 3-MCP using tailored femtosecond laser pulses has recently been demonstrated [1]. We now aim to build on this study to resolve the CDIY effect into different photoelectron kinetic energy bands. To this end we extend the twin focus approach [2], with two spatially separated foci of opposite and alternating circular polarization in an ion time-of-flight mass spectrometer, to Photoelectron Photoion Coincidence (PEPICO) spectroscopy [3]. Moreover, our temperature-variable molecular beam cluster source allows tuning the 3-MCP conformer composition within limits and, in the future, to explore effects oof micro-solvation via clustering individual water molecules to the chiral molecule.
[1] Das et al., Phys. Chem. Chem. Phys., 27, 8043-8051 (2025) [2] Ring et al., Rev. Sci. Instrum. 92, 033001 (2021) [3] Müller et al., JPCA 118, 8517 (2014)
Keywords: Chirality; femtosecond laser; PEPICO; Circular Dichroism