Dresden 2011 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 4: Femtosecond Spectroscopy I

MO 4.3: Vortrag

Montag, 14. März 2011, 15:00–15:15, TOE 317

Fully noncollinear coherent 2D-UV spectroscopy — •Ulrike Selig, Carl-Friedrich Schleussner, Michael Foerster, Florian Langhojer, Patrick Nuernberger, and Tobias Brixner — Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg

In the last decade coherent two-dimensional (2D) spectroscopy in the infrared and visible spectral range has proven its ability to unravel couplings and associated transfer processes. The extension of this powerful technique to the ultraviolet (UV) may ultimately help to clarify the much-debated role of electronic excitons in the efficient energy redistribution within DNA strands, protecting them from severe photodamage.

Here we introduce fully noncollinear coherent 2D spectroscopy in the ultraviolet domain with an all-reflective and miniaturized setup design. Phase stability is achieved via pairwise beam manipulation and the concept can be transferred to all wavelength regimes. We present results from an implementation that has been optimized for wavelengths between 250 nm and 375 nm. Interferometric measurements prove phase stability over several hours. We obtained 2D spectra of the nonpolar UV chromophore p-terphenyl in ethanol, excited with 50 fs pulses at 287 nm.