  Resonant elastic X-ray scattering has been widely employed for exploring
complex electronic ordering phenomena, like charge, spin, and orbital order, in
particular in strongly correlated electronic systems. In addition, recent
developments of pump-probe X-ray scattering allow us to expand the
investigation of the temporal dynamics of such orders. Here, we introduce a new
time-resolved Resonant Soft X-ray Scattering (tr-RSXS) endstation developed at
the Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL). This
endstation has an optical laser (wavelength of 800 nm plus harmonics) as the
pump source. Based on the commissioning results, the tr-RSXS at PAL-XFEL can
deliver a soft X-ray probe (400-1300 eV) with a time resolution about ~100 fs
without jitter correction. As an example, the temporal dynamics of a charge
density wave on a high-temperature cuprate superconductor is demonstrated.

Instrumentation and Detectors;Materials Science;Strongly Correlated Electrons