Time resolved resonant inelastic X ray scattering A supreme tool to understand dynamics in solids and molecules

Dynamics in materials typically involve different degrees of freedom, like charge, lattice, orbital and spin in a complex interplay. Time resolved resonant inelastic X ray scattering RIXS as a highly selective tool can provide unique insight and follow the details of dynamical processes while resolving symmetries, chemical and charge states, momenta, spin configurations, etc. In this paper, we review examples where the intrinsic scattering duration time is used to study femtosecond phenomena. Free electron lasers access timescales starting in the sub ps range through pump probe methods and synchrotrons study the time scales longer than tens of ps. In these examples, time resolved resonant inelastic X ray scattering is applied to solids as well as molecular system