Mamontov Eugene
Chemical and Engineering Materials Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
J Phys Condens Matter. 2016 Sep 1;28(34):345201. doi: 10.1088/0953-8984/28/34/345201. Epub 2016 Jun 29.
We present a concept and ray-tracing simulation of a mechanical device that will enable inelastic neutron scattering measurements where the data at energy transfers from a few μeV to several hundred meV can be collected in a single, gapless spectrum. Besides covering 5 orders of magnitude on the energy (time) scale, the device provides data over 2 orders of magnitude on the scattering momentum (length) scale in a single measurement. Such capabilities are geared primarily toward soft and biological matter, where the broad dynamical features of relaxation origin largely overlap with vibration features, thus necessitating gapless spectral coverage over several orders of magnitude in time and space. Furthermore, neutron scattering experiments with such a device are performed with a fixed neutron final energy, which enables measurements, with neutron energy loss in the sample, at arbitrarily low temperatures over the same broad spectral range. This capability is also invaluable in biological and soft matter research, as the variable temperature dependence of different relaxation components allows their separation in the scattering spectra as a function of temperature.
我们提出了一种机械装置的概念和射线追踪模拟，该装置将实现非弹性中子散射测量，能够在单个无间隙光谱中收集能量转移从几微电子伏特到几百毫电子伏特的数据。除了在能量（时间）尺度上覆盖5个数量级外，该装置在单次测量中还能在散射动量（长度）尺度上提供超过2个数量级的数据。这些能力主要针对软物质和生物物质，在这些物质中，弛豫起源的广泛动力学特征在很大程度上与振动特征重叠，因此需要在时间和空间上跨越几个数量级的无间隙光谱覆盖。此外，使用这种装置进行的中子散射实验是在固定的中子最终能量下进行的，这使得能够在样品中存在中子能量损失的情况下，在任意低温下在相同的宽光谱范围内进行测量。这种能力在生物和软物质研究中也非常宝贵，因为不同弛豫成分的可变温度依赖性使得它们能够在散射光谱中作为温度的函数被分离出来。
