Abstract
The instruments best suited to performing high-energy-resolution neutron spectroscopy are spin-echo spectrometers and backscattering spectrometers. The development of these experimental techniques dates back almost half a century, and most major neutron scattering facilities operate mature spectrometers of one or both classes. Recent advances in instrumentation and neutron sources are enhancing their performance and expanding their capabilities, with the objective of enabling researchers to tackle new and more complex problems. In this Technical Review, we assess the current state of the art in high-energy-resolution neutron spectrometers, showcasing their role in the study of nanoscale dynamics in soft and biological materials, as well as disordered magnets. Neutron spectroscopy is a powerful probe to study the dynamics in materials. This Technical Review assesses the state-of-the-art experimental spectroscopic methods, which are optimized to provide high energy resolution and can reveal dynamic processes on the picosecond and nanosecond timescales.
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