Heidelberg 2015 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 5: Posters 1: Novelties in Molecular Physics

MO 5.9: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Time-dependent photoelectron spectroscopy of all-trans retinal in liquid micro-jet — •Iason Katechis¹, Kathrin Aziz-Lange^1,2, Martin Eckstein¹, Johan Hummert¹, Franziska Buchner¹, Andrea Lübcke¹, and Oleg Kornilov¹ — ¹Max Born Institute Berlin, Germany — ²present address: Helmholtz Zentrum Berlin, Germany

The isomerization of all-trans-retinal, the primary step in vision, has been studied in great detail. Nevertheless the ordering of its excited states, their lifetimes and how these are affected by different solvent environments remain unclear. Time-resolved femtosecond spectroscopy promises to shed light on these questions, however several studies performed so far report contradictory results on the lifetimes observed in experiments and this leads to an ambiguity in the choice of a photophysical model.

In our study we employ time-resolved photoelectron spectroscopy of retinal in a liquid micro-jet for different solvents. We observe that it is important to investigate different data analysis strategies since they can lead to contradicting results. We hence compare methods including global fitting and singular value decomposition (SVD) along with more flexible photophysical models than those assumed so far in order to get deeper insight into the underlying mechanisms.