Heidelberg 2015 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 16: Posters 3: Novelties in Molecular Physics
MO 16.4: Poster
Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer
Ultrafast dynamics of mixed trihalides in solution — •Sebastian Schott, Lea Reß, Julia Heitmüller, Anja Hasenkopf, Florian Kanal, Patrick Nuernberger, and Tobias Brixner — Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
The Trihalide I3− is not only a very successful model system for ultrafast time-resolved spectroscopy [1], but also plays an important role in dye-sensitized solar cells [2]. Recently, the efficiency of such cells could be increased by adding the mixed trihalide I2Br− to the electrolyte [3]. Another feature of asymmetric mixed trihalides, e.g. BrICl−, is the existence of two distinguishable chemical bonds. Therefore, in contrast to the symmetric triiodide, a photodissociation reaction may result in different fragments, e.g. BrICl + hν → BrI + Cl or Br + ICl. We use transient absorption spectroscopy with supercontinuum white-light probe pulses to investigate possible reaction paths of several mixed trihalides 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] B. O’Regan, M. Grätzel, Nature 1991, 353, 737
[3] N. C. D. Nath, H. J. Lee, W.-Y. Choi, J.-J. Lee, Electrochim. Acta 2013, 109, 39