Brillouin scattering of neutrons for the study of the microscopic dynamics of fluids

Brillouin scattering is the spectroscopic technique applied to the probing of acoustic excitations in condensed matter. Significant advances in instrumentation have led to the development of various Brillouin spectroscopies in addition to the first exploited light scattering methods, extending the study of sound propagation to a very wide range of excitation wavelengths. The role of Brillouin scattering of neutrons is discussed and a few examples are given of its potentiality for an in-depth investigation of microscopic dynamics and interactions in fluids.