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Multi-wavelength data collection strategies in inelastic neutron scattering

机译：非弹性中子散射中的多波长数据收集策略

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The overwhelming tradition in neutron-scattering research was the use of a monochromatic incoming beam with a single wavelength for essentially all kinds of experiments, with only a very few exceptions in the practice at continuous neutrons sources. The situation dramatically changed with the spread of pulsed spallation sources, where the wavelength scanning "energy dispersive" time-of-flight approach is the natural rule in all diffraction type work and in inverted geometry inelastic spectroscopy. In recent years, a number of new applications of multi-wavelength data collection strategies emerged in inelastic neutron spectroscopy, both at continuous and pulsed sources. The aim or the present paper is to review these developments. Time-of-flight (TOE) and Neutron Spin Echo (NSE) lend themselves most easily to such methods, since they allow rather exact comparison of absolute scattering intensities measured at different instrumental configurations. The use of multiple wavelengths can offer different kinds of advantages in neutron spectroscopy. Since the resolution of spectrometers rapidly changes with the wavelength, its variation can be effectively used to extend the available dynamic range. Inelastic multiple scattering effects can be precisely identified and corrected for by their inherently strong wavelength dependence. At pulsed spallation sources the multi-wavelength approach opens up the way to enhance data collection rates by eliminating at least a large part of the dead time between too distant Source pulses. (c) 2006 Elsevier B.V. All rights reserved.
机译：中子散射研究的压倒性传统是基本上所有类型的实验都使用具有单一波长的单色入射光束，在连续中子源的实践中只有极少数例外。随着脉冲散裂源的扩散，情况发生了巨大变化，其中波长扫描“能量色散”飞行时间方法是所有衍射类型工作和倒置几何非弹性光谱中的自然法则。近年来，在非弹性中子光谱学中，连续和脉冲源都出现了许多多波长数据收集策略的新应用。目的或本文件旨在回顾这些发展。飞行时间（TOE）和中子自旋回波（NSE）最适合于此类方法，因为它们可以相当精确地比较在不同仪器配置下测量的绝对散射强度。在中子光谱学中，使用多个波长可以提供不同的优势。由于光谱仪的分辨率会随波长快速变化，因此可以有效地利用其变化来扩展可用的动态范围。非弹性多重散射效应可以通过其固有的强波长依赖性进行精确识别和校正。在脉冲散裂源中，多波长方法通过消除太远的源脉冲之间的死区时间中的至少大部分，开辟了提高数据收集率的方式。 （c）2006 Elsevier B.V.保留所有权利。

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