Mainz 2026 – scientific programme
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MO: Fachverband Molekülphysik
MO 27: Molecular Spectroscopy II
MO 27.4: Talk
Thursday, March 5, 2026, 15:15–15:30, P 204
Dissociative Single and Double Ionization of Thymine — •Sitanath Mondal1, Sitanath Mondal1, Sitanath Mondal2, Sitanath Mondal2, Sitanath Mondal1, and Sitanath Mondal1 — 1Institute of Physics, University of Freiburg, Germany — 2Desirs Beamline, Synchrotron Soleil, St. Aubin, France
Radiation damage on biological materials including DNA and RNA is an important research topic. Electron-Ion coincidence studies of biomolecules in gas phase can give insight about the energetics of dissociative ionization processes. While the single ionization and corresponding fragmentation has been studied previously in detail, fewer details are known about dissociative double ionization processes. I will present an electron-ion-ion coincidence study of the single and double ionization of thymine at 36 eV. The electron-ion multi-coincidence detection provided by the DELICIOUS III spectrometer at the DESIRS beamline of Soleil synchrotron enables us to retrieve detailed information on dissociative double ionization channels, including the fragment ion momentum distributions and photoelectron images of selected double ionization channels. We find pronounced differences between the dissociation channels we observe, and those previously reported for single valence shell and core level ionization, with a multitude of possible dissociation pathways accessible at this comparably low excess energy.
Keywords: synchrotron; kinetic energy release; double ionization; photoelectron-photoion coincidence; fragmentation