School of Physics, University College Dublin, Dublin 4, Ireland.
School of Chemistry, University College Dublin, Dublin 4, Ireland.
Sci Rep. 2019 Aug 2;9(1):11284. doi: 10.1038/s41598-019-46835-z.
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.
我们提出了一种新的中子散射方法，可直接在时域中获取范霍夫分布函数 I(t)，从而反映系统动态。目前，I(t)主要通过中子能量交换来确定。我们的方法包括通过计算在时间 t 内对应于静止物质的散射中子部分，直接测量 I(t)的积分，（概念上是弹性散射）。之前的尝试未能认识到这种联系。从理论角度出发，通过数值方法和仪器模拟来评估实际实现。
