Publications by authors named "A Pietzsch"
The Heisenberg-RIXS instrument at the European XFEL.
J Synchrotron Radiat
January 2025
Resonant inelastic X-ray scattering (RIXS) is an ideal X-ray spectroscopy method to push the combination of energy and time resolutions to the Fourier transform ultimate limit, because it is unaffected by the core-hole lifetime energy broadening. Also, in pump-probe experiments the interaction time is made very short by the same core-hole lifetime. RIXS is very photon hungry so it takes great advantage from high-repetition-rate pulsed X-ray sources like the European XFEL.
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- The research explores the varying hydrogen bond network of liquid water at room temperature, highlighting the diversity of HO molecular structures and their potential energy surfaces.
- Using advanced techniques like resonant inelastic X-ray scattering, the study measures and compares the potential energy of HO molecular configurations in both gas and liquid phases, employing various modeling approaches.
- The findings reveal a range of HO molecular potentials in liquid water, from weak to strongly distorted interactions, and relate these to existing data on intermolecular distances obtained from neutron scattering.
Chelating agents are an integral part of transition metal complex chemistry with broad biological and industrial relevance. The hexadentate chelating agent ethylenediaminetetraacetic acid (EDTA) has the capability to bind to metal ions at its two nitrogen and four of its carboxylate oxygen sites. We use resonant inelastic X-ray scattering at the 1s absorption edge of the aforementioned elements in EDTA and the iron(III)-EDTA complex to investigate the impact of the metal-ligand bond formation on the electronic structure of EDTA.
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- BESSY II has successfully implemented resonant inelastic X-ray scattering in the XUV-regime, achieving a bandwidth of a few meV at various X-ray edges, including transition metals and light elements like carbon.
- A new low-energy beamline, UE112-PGM1, has been specifically designed to focus the beam to 1 µm vertically and 20 µm horizontally, facilitating high-resolution spectroscopy.
- The beamline demonstrates a resolving power better than 10,000 at 64 eV, while the associated high-resolution spectrometer shows a resolving power range of 3000 to 6000.
Tautomerism is one of the most important forms of isomerism, owing to the facile interconversion between species and the large differences in chemical properties introduced by the proton transfer connecting the tautomers. Spectroscopic techniques are often used for the characterization of tautomers. In this context, separating the overlapping spectral response of coexisting tautomers is a long-standing challenge in chemistry.
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