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High Quality Content by WIKIPEDIA articles! X-ray Raman scattering (XRS) is non-resonant inelastic scattering of x-rays from core electrons. IT is analogous to Raman scattering, which is a largely-used tool in optical spectroscopy, with the difference being that the wavelengths of the exciting photons fall in the x-ray regime and the corresponding excitations are from deep core electrons. XRS Is an element-specific spectroscopic tool for studying the electronic structure of matter. IN particular, it probes the excited-state density of states (DOS) of an atomic species in a sample. XRS Is an inelastic x-ray scattering process, in which a high-energy x-ray photon gives energy to a core electron, exciting it to an unoccupied state.