Development of a Filter-Analyzer Neutron Spectrometer at the National Institute of Standards and Technology

小行星9512225 美国国家标准与技术研究所（NIST）将设计、建造和运行一种新型高强度滤光片分析仪中子谱仪（FANS），该仪器由来自宾夕法尼亚大学、加州大学圣巴巴拉分校、NIST、休斯飞机公司、杜邦公司和联合信号公司的科学家组成。新FANS的吞吐量和灵敏度将超过在美国已经独一无二的严重超额订购的原型的至少五十倍。建成后，FANS将成为世界上最灵敏的中子谱仪，用于通过中子的非弹性散射研究10-100百万电子伏范围内的振动模式。FANS仪器将用于研究分子晶体和液体、聚合物、主客体系统（如金属中的氢和沸石中的碳氢化合物）中的分子内和分子间振动，以表征富勒烯和微管等碳的新形式，以及环境安全制冷剂的新候选分子。 FANS的发展将满足该国科学基础设施的迫切需要。目前世界上只有两台这样的仪器，一台在法国，一台在NIST，它们都被大量订购。FANS将对分子光谱学研究产生广泛的影响，因为美国目前的中子设施不足以进行分子动力学研究。 ***

9512225 Klein A new, high intensity filter-analyzer neutron spectrometer (FANS) will be designed, constructed, and operated at the National Institute of Standards and Technology (NIST) by a consortium of scientists from the University of Pennsylvania, the University of California at Santa Barbara, NIST, Hughes Aircraft, DuPont, and Allied-Signal. The throughput and sensitivity of the new FANS will exceed by a factor of at least fifty that of a heavily oversubscribed prototype which is already unique in the US. When completed, FANS will be the most sensitive neutron spectrometer in the world for studies of vibrational modes in the 10-100 millielectron-volt range by inelastic scattering of neutrons. The FANS instrument will be used to study intra- and intermolecular vibrations in molecular crystals and liquids, polymers, guest-host systems such as hydrogen in metals and hydrocarbons in zeolites, to characterize novel forms of carbon such as fullerenes and tubules, and novel candidate molecules for environmentally safe refrigerants. %%% The development of the FANS will fill an urgent need of the country's scientific infrastructure. There are currently only two such instruments in the world, one in France and one prototype at NIST, and they are both heavily subscribed. The FANS will have a wide impact on molecular spectroscopy research, as current neutron facilities in the US are inadequate for studies of molecular dynamics. ***