Mainz 2017 – scientific programme

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MO: Fachverband Molekülphysik

MO 12: Posters 2: Molecular Dynamics, Clusters, and High Resolution Spectroscopy

MO 12.6: Poster

Wednesday, March 8, 2017, 17:00–19:00, P OG1

Time-resolved XUV photoelectron spectroscopy of organic dyes in solution — •Johan Hummert, Ivgenii Inkonnikov, Nicola Mayer, Martin Eckstein, and Oleg Kornilov — Max-Born-Institut für nichtlineare Optik und Kurzzeitspektroskopie, Berlin

The electronic dynamics of organic molecules after photoexcitation are of great interest for biologically relevant systems as well as synthetic functional complexes. Often the environment, in many cases an aqueous solution, has a strong influence on the electronic structure. With the development of the liquid jet technique [1] methods demanding high vacuum conditions became applicable to molecules in solution.

The method employed here is time-resolved XUV photoelectron spectroscopy. Wavelength-selected high harmonics provided by a recently developed monochromator setup [2] are applied to probe the electronic relaxation of solvated molecules after single photon excitation with visible light. The high collection efficiency of a magnetic bottle spectrometer enables us to clearly distinguish molecular signals from strong solvent signals.

In a benchmark experiment with the water soluble dye "Quinoline Yellow WS" we measure ground state ionization energies and observe relaxation of excited states in solution. Excited state spectra and decay constants can be measured for concentrations down to 10mM, which establishes this technique for a wide range of samples.

[1] Faubel et. al., J. Chem. Phys. 106, 9013-31 (1997)

[2] Eckstein et. al., JPCL 6, 419-25 (2015)