En avbildande mjukröntgenspektrometer för SXES- och RIXS-mätningar vid XFELs SQS-stationIn-kind bidrag
Tidsperiod: 2016-01-01 till 2019-12-31
Projektledare: Jan-Erik Rubensson
Medarbetare: Joseph Nordgren, Joseph Ntaganira, Joseph Otieno, Franz Hennies, Marcus Agåker, Marcus Agåker Agåker
Budget: 1 924 000 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 bewteeen matter and the ultraintense, ultrafast pulses expected at the XFEL in Hamburg. As a photon-in-photon-out technique it is, unlike electron spectroscopy, not limited by plasma potentials and space charge effects.We propose to build an imaging X-ray emission spectrometer as an in-kind contribution for the SQS station at XFEL. The energy dispersion is accomplished with a grating in one dimension, and the imaging with a spherical mirror in the perpendicular dimension. As the photon pulse is modified when it propagates through the medium the scattering processes change character, and to analyze this behavior in detail the new spectrometer analyses the scattered radiation with spatial resolution along the beam. The new spectrometer also 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.We expect that this infrastructure substantially will increase the understanding of non-linear X-ray processes, thereby with important ramifications in many scinetific fields.