Experimentalphysik IV

From 05.06. - 12.06.2024, Yusaku Terao, Johannes Viehmann, Gabriel Klassen, Christina Zindel und Catmarna Küstner-Wetekam experimented at the P04 beamline of the PETRA III accelerator in Hamburg. They recorded luminescence spectra of solvated nucleotides (Adeninmonophosphate AMP and Uridinemonophosphate UMP). These are supposed to yield information about the deexcitation of DNA components after X-ray irradiation when they are embedded in a watery environment.

On 30.05.2024,  our group published an article in Nature Communications. A radiation damage cycle in X-ray-ionized solvated Mg ions is reported by the authors leading to production of water radicals and low-energy electrons. The Mg ion ends in its initial state quickly and can restart the cycle, multiplying the local damage. 

D. Bloß et al., "X-ray radiation damage cycle of solvated inorganic ions", Nature Communications, 15, 4594 (2024).
DOI: https://doi.org/10.1038/s41467-024-48687-2

Also interesting: Press release of the university of Kassel.

In the period from 19.05. - 04.06.2024, our group absolved two beamtimes at the FlexPES beamline of the MAX IV storage ring in Lund, Sweden. The experiments were performed by Yusaku Terao, Niklas Golchert, Johannes Viehmann, Joel Herrmann, Gabriel Klassen, Emilia Heikura, Dana Bloß, Andreas Hans and Adrian Krone with the helpful support of Noelle Walsh and Maxim Tchaplyguine.

During the first experiment, the fluorescence of solvated nucleotides (Cytidinmonophosphate CMP) was measured, in order to investigate their relaxation after inner-shell ionization by X-rays. For this purpose, a liquid microjet was combined with a Seya-Namioka spectrometer. In the second experiment, a magnetic-bottle-type electron spectrometer was used in combination with a rare-gas cluster source in order investigate multiple (non-local) processes in prototypical many-particle systems with the multielectron coincidence technique.