Hannover 2016 – scientific programme
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MO: Fachverband Molekülphysik
MO 9: Biomolecules and Photochemistry
MO 9.7: Talk
Tuesday, March 1, 2016, 16:15–16:30, f102
Tracking chemical reactions with time-resolved sulfur-1s-spectroscopy: Light induced radical formation and isomerization of 4-Methylbenzenethiol in the liquid phase — Miguel Ochmann1, •Inga von Ahnen1, Amy Cordones-Hahn2, Abid Hussain1, Jae Hyuk Lee2, Kiryong Hong2,3, Katrin Adamczyk1, Tae Kyu Kim3, Robert W. Schonlein2, Oriol Vendrell1, and Nils Huse1 — 1Department of Physics, University of Hamburg and Max Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser Science, Hamburg, Germany — 2Ultrafast X-ray Science Lab, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA — 3Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University, Busan, South Korea
Sulfur analogues to alcohols (R-SH) are abundant in nature and their chemistry is similar to alcohols. Recent results on the model system 4-methylbenzenethiol from transient absorption spectroscopy indicate sulfur radical generation upon UV excitation and formation of another species which eludes identification by optical spectroscopy. It was theorized that the hydrogen atom attaches to the aromatic ring. We used transient Sulfur-1s spectroscopy as a new element-specific probe of transient electronic and molecular structure. Two induced absorption peaks below the ground-state bleach clearly indicate formation of two new sulfur-species. Using TDDFT calculations we identified the thio-radical and a thione isomer with the photoejected hydrogen atom attached to the aromatic ring.