Rostock 2019 – scientific programme

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MO: Fachverband Molekülphysik

MO 8: XUV and X-ray Excitation and Spectroscopy

MO 8.6: Talk

Monday, March 11, 2019, 17:30–17:45, S HS 001 Biologie

Soft X-ray Absorption Spectroscopy of Aqueous Solutions Using a Table-Top Femtosecond Soft X-ray Source — •Carlo Kleine, Maria Ekimova, Gildas Goldsztejn, Sebastian Raabe, Christian Strüber, Jan Ludwig, Suresh Yarlagadda, Stefan Eisebitt, Marc Vrakking, Thomas Elsaesser, Erik Nibbering, and Arnaud Rouzée — Max-Born-Institut

The advent of novel light sources like free electron lasers and high-harmonic generation (HHG) sources that offer the possibility to generate radiation in the soft X-ray wavelength range with femtosecond pulse durations has sparked widespread interest in the development of various forms of ultrafast, element-specific core-level spectroscopy. Here, we demonstrate the feasibility of soft X-ray absorption spectroscopy in the water window on organic molecules and inorganic salts in aqueous solution using a table-top laser-based approach. Using a high-order harmonic source that delivers femtosecond pulses of short wavelength radiation in the photon energy range from 220 eV to 450 eV, we report static soft X-ray absorption measurements in transmission mode on a series of solvated compounds using flatjet technology. We monitor the absorption of the molecular samples between the carbon (280 eV) and nitrogen (400 eV) K-edges and compare our results with previous measurements performed at the BESSYII facility. We discuss the roles of pulse stability and photon flux in the outcome of our experiments. Our experiment paves the way towards table-top femtosecond, solution phase soft X-ray absorption spectroscopy in the water window.