Time-resolved RIXS on Correlated Materials RIXS: • Charge Transfer • Spin • Orbital • Lattice • Many-body wavefunction mapping High-Tc cuprates Bi2201 Single magnon Important characterization tools for non-equilibrium dynamics! Quasi 1D edge shared cuprates Wish List: (an x-ray FEL for spectroscopy) •Soft x-ray, 400-2000 eV •THz to Mid-IR pumping. • Seeded x-ray FEL: •Tunable transform limited x-ray FEL. (DE < 100 meV, Dt ~ 100 fs) •Less jitter, especially in intensity •No need for Monochromator -> more flux •Tight focus (<10 um) -> high resolution for the RIXS spectrometer. •Higher Repetition rate for more flux (?) W. S. Lee, Y. D. Chuang, T. P. Devereaux, Z. X. Shen, Z. Hussian •Sufficient space in hutch to accommodate high resolution spectrometer (~ 5m) at different 2q angles, (say 30 160+).