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S2XAFS: Time-resolved X-ray absorption spectroscopy in a ‘single-shot’ – First in situ applications
(2017)
The newly developed EXAFS set-up comprises both time- and spatially-resolved EXAFS information simultaneously in a single-shot. This facile, stable and scanningless set-up was tested at the BAMline @ BESSY-II (Berlin, Germany). The pri-mary broadband beam is generated by a filter/X-ray-mirror combination (bandpass). The transmitted beam through the sample is diffracted by a convexly bent Si (111) crystal, producing a divergent beam. This, in turn, is collected by an area sensitive detector, in a theta - 2 theta geometry. The first in situ measurements were successfully carried out and hereby presented. The case-study deals with research on Zn-based Metal-Organic-Frameworks (MOFs) that have potential for medi-cal/pharmaceutical applications. This hot topic of MOF research targets encapsulation of therapeutically relevant bio-macromolecules (e.g. Enzymes) for drug delivery applications. Questions regarding the influence of proteins on the coor-dination of Zn during MOF crystal growth and within the final MOF can be answered with this new setup. We were able to track structural changes within a 1s time resolution.