Bonn 2025 – scientific programme
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MO: Fachverband Molekülphysik
MO 13: Ultrafast Dynamics II
MO 13.7: Talk
Wednesday, March 12, 2025, 12:30–12:45, HS XVI
Understanding fragmentation dynamics of difluorodiiodomethane — •Nidin Vadassery1,3, Sebastian Trippel1, 2,4, and Jochen Küpper1, 2, 3, 4 — 1Center for Free-Electron Laser Science, Deutches Elektronen-Synchrotron DESY, Hamburg, Germany — 2Center for Ultrafast Imaging, Universität Hamburg, Hamburg, Germany — 3Department of Chemistry, Universität Hamburg, Hamburg, Germany — 4Department of Physics, Universität Hamburg, Hamburg, Germany
Unimolecular photo-fragmentation is crucial in environmental chemical reactions like ozone depletion and aerosol formation [1]. Photo-dissociation of polyhalohydrocarbons significantly contributes to these climate-impacting processes. Difluorodiiodomethane (CF2I2) exhibits unconventional dynamics near dissociative energies [2]. We present experimental results exploring CF2I2 dissociation dynamics using near-infrared laser pulses. A pure CF2I2 sample was produced using an electrostatic deflector, revealing metastable states and quantum-state-specific dynamics during photo-fragmentation [3]. We also outline a time-resolved x-ray diffraction approach and present computational results of diffraction simulations for laser-aligned gas-phase CF2I2.
[1] J. C. G. Martin, et al., J. Am. Chem. Soc. 144, 9240 (2022)
[2] P. Z. El-Khoury, et al., J. Chem. Phys. 132, 124501 (2010)
[3] I. S. Vinklárek, et int. (3 authors), J. Küpper, S. Trippel, J. Phys. Chem. A 128, 1593(2024) arXiv:2308.08006 [physics].