Momentum Resolved Resonant Inelastic Scattering End Station (Collaborative Access)
Currently under development the qRIXS station is optimized for time-resolved and momentum-resolved resonant inelastic X-ray scattering (qRIXS). The goal of this endstation is to study the dynamics of charge/spin excitations of solids in both time and energy domains, especially focus on the L-edge of the transition metal oxide and M-edge of the rare earth elements. The endstation will be equipped with three emission spectrographs. The spectrographs will have a maximum resolving power around 5000 at 540 eV incident photon energy. They will be self-supported by kinetic mounts on the support platform on top of a hexapod structure. Five mounting ports with an angular interval of 25 degrees in the horizontal scattering plane and +/-15 degrees of endstation rotation relative to the incident photon beam (achieved by moving the hexapod) allows the scattered X-rays in the angular range of 25 ~ 155 degrees to be recorded. This design allows the users to probe a wide range of momentum transfer. The spectrograph is necessary for the time-resolved pump-probe inelastic scattering experiment, as it can record a spectrum across a range of energy loss simultaneously. This end station will also be equipped with avalanche photodiodes for measuring the total fluorescence yield as diagnostic XAS curves for the RIXS experiment. The sample stage is electrically isolated from ground such that the total electron yield can also be recorded. This end station is expected to be commissioned in 2015. An additional spectrograph with polarization analyzer will become available in 2016.