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We establish the spectral line shape of orbital excitations created byresonant inelastic X-ray scattering for the model Mott insulator CoO. Improvedexperimental energy resolution reveals that the line shapes are strikinglydifferent from expectations in a first principles-based atomic multiplet model.Extended theoretical simulations are performed to identify the underlyingphysical origins, which include a pronounced thermal tail reminiscent ofanti-Stokes scattering on the energy gain side of excitations, and an essentialcontribution from interatomic many-body dynamics on the energy loss side ofexcitations.

Measurement of the spectral line shapes for orbital excitations in the Mott insulator CoO using high-resolution resonant inelastic x-ray scattering