Förbättrade prestanda hos röntgenspektrometern vid XFEL
Tidsperiod: 2015-01-01 till 2017-12-31
Projektledare: Jan-Erik Rubensson
Medarbetare: Joseph Nordgren, Joseph Ntaganira, Joseph Otieno, Marcus Agåker, Marcus Agåker Agåker
Budget: 1 998 000 SEK
Resonant inelastic soft X-ray scattering spectroscopy has several important features that makes is attractive for studies ranging from fundamental phenomena in atoms and molecules to the function of complex materials and processes of technical and biological interest. The technique is also well adapted to study the fundamental interaction between matter and the ultraintense, ultrashort pulses expected at the XFEL in Hamburg. We have earlier achieved funding for the construction of an imaging X-ray emission spectrometer as an in-kind contribution for the SQS station at XFEL. In the original plan the imaging was accomplished with a spherical mirror. During the detailed analysis of the instrument it was realized that crucially improved performance could be achieved if the spherical mirror were replaced by Wolter optics, and we here apply for additional funding for the implementation of this improvement,The spectrometer allows for pump-probe measurements, where the imaging capabilities and the known pulse speed are used to transform the imaged length scale to the time domain. With the improved optics the time scale for core hole lifetimes, nuclear rearrangement and to some extent also electron dynamics is attainable. We expect that this infrastructure, in particular with the proposed improvement of the optical scheme, substantially will increase the understanding of ultrafast dynamics and non-linear X-ray processes, implying ramifications in many scientific fields.