We present a new neutron-scattering approach to access the van Hove distribution function directly in the time domain, I(t), which reflects the system dynamics. Currently, I(t) is essentially determined from neutron energy-exchange. Our method consists of the straightforward measurement of the running time-integral of I(t), by computing the portion of scattered neutrons corresponding to species at rest within a time t, (conceptually elastic scattering). Previous attempts failed to recognise this connection. Starting from a theoretical standpoint, a practical realisation is assessed via numerical methods and an instrument simulation.
Benedetto, A., Kearley, G.J. (2019). Dynamics from elastic neutron-scattering via direct measurement of the running time-integral of the van Hove distribution function. SCIENTIFIC REPORTS, 9(1), 11284 [10.1038/s41598-019-46835-z].