Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 6: Femtosecond Spectroscopy 1

MO 6.3: Vortrag

Dienstag, 18. März 2014, 11:15–11:30, BEBEL HS213

Ultrafast dynamics of asymmetric trihalides – Which bond breaks? — •Sebastian Schott, Anja Hasenkopf, Florian Kanal, Patrick Nuernberger, and Tobias Brixner — Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

Trihalides are very successful model systems for ultrafast time-resolved spectroscopy. These molecules allow detailed theoretical treatments, due to their small size, while providing pronounced dynamic observables. Especially triiodide I3 has been studied extensively with ultrafast spectroscopy in solution, e.g. by Ruhman [1] and Vöhringer [2]. The special feature of the asymmetric trihalides IBrCl, I2 Br, I2 Cl and Br2 Cl, compared to the well-known symmetric triiodide, is the existence of two distinguishable chemical bonds. Therefore, the existence of two different diatomic fragments after photodissociation (e.g. IBrCl + hν → IBr + Cl or ICl + Br) is in principle possible. We use transient absorption spectroscopy with supercontinuum white-light probe pulses to investigate possible reaction paths with the aim to elucidate which parameters may have an impact on the outcome of the photoinduced dynamics. Especially, pronounced wave packet oscillations, observed during the first 3 ps, are promising for the identification of the newly formed products.

[1] U. Banin, A. Waldman, S. Ruhman, J. Chem. Phys. 1992, 96, 2416

[2] T. Kühne, P. Vöhringer, J. Chem. Phys. 1996, 105, 10788

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