Mainz 2026 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 10: Poster – Ultrafast Structural Dynamics
MO 10.1: Poster
Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG
Direct observation of uracil cation fragmentation via metastable intermediate — •Aditi Pradhan1,2, Atilay Ayasli1, Ivo S. Vinklárek1, Hubertus Bromberger1, Sebastian Trippel1,3, and Jochen Küpper1,2,3 — 1Center for Free-Electron Laser Science (CFEL), Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 2Department of Chemistry, Universität Hamburg, Germany — 3The Hamburg Center for Ultrafast Imaging (CUI), Universität Hamburg, Germany
Nucleobases are remarkably photostable biomolecules with complex relaxation dynamics at picosecond timescales [1], making them ideal test beds to explore ultrafast fragmentation dynamics with atomic-scale precision. We employ the versatile transportable endstation for controlled molecules (eCOMO) [2] to study isolated uracil molecules as well as hydrated clusters in a size-selected fashion [3]. Our photodissociation experiment in the strong-field regime reveals a metastable fragmentation pathway of uracil cation, enabled by 3D imaging beamplots. The findings are supported by lifetime estimates and accompanied by preliminary theoretical results.
[1]Nachtigallová et int. (4 authors), Lischka, J. Phys. Chem. A,21 115 (2011)
[2]Jin et int. (8 authors), Küpper, submitted (2024), arXiv:2406.16491 [physics]
[3]Chang et int. (2 authors), Küpper, Int. Rev. Phys. Chem., 34, 1077838 (2015) arXiv:1505.05632 [physics]
Keywords: molecular dynamics; clusters; ultrafast imaging