Hannover 2016 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 9: Biomolecules and Photochemistry

MO 9.3: Vortrag

Dienstag, 1. März 2016, 15:15–15:30, f102

Time-resolved XUV photoelectron spectroscopy of organic molecules in solution — •Johan Hummert, Geert Reitsma, Iason Katechis, Martin Eckstein, and Oleg Kornilov — Max Born Institut Berlin, Germany

The characteristics and function of biologically relevant molecules are often controlled by their environment, i.e. an aqeous solution or a protein. To investigate this interaction it is therefore imperative to study electronic structure and dynamics of molecules in solution. For this purpose we implement time-resolved photoelectron spectroscopy which can provide information unaccessable with techniques like transient absorption spectroscopy.

We combine our time delay compensating XUV monochromator [1] with the liquid jet technique [2]. This enables us to probe molecular electronic states with a single XUV photon of tunable energy in the range of 10 to 50 eV. With a tunable excitation wavelength (TOPAS) and a demonstrated time resolution of 40fs our setup is promising for Investigation of diverse organic molecules in multiple solvents.

In first experiments we resolve the electronic ground states of water soluble molecules, investigating the shift of the ionization potential due to solvation. We further observe changes of the photoelectron spectrum of liquid water upon exposure to 400 nm light.

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

[2] Faubel et. al., JCP 106, (1997): 9013-31