Abstract
Resonant epithermal neutron scattering provides a new regime for the study of the properties of condensed matter. The differential scattering cross section is developed in a resonant-correlation-function formalism involving the positions of two scattering centers at four different times. The resonant correlation functions contain information which cannot be obtained from a study of the Van Hove correlation functions which are related to the thermal neutron scattering law, and these resonant correlation functions enable one to observe phenomena which are beyond the scope of thermal neutron scattering. The extraction of the time-dependent interatomic force density is taken as an example.
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