VIVALDI—A thermal-neutron laue diffractometer for physics, chemistry and materials science
VIVALDI—A thermal-neutron laue diffractometer for physics, chemistry and materials science
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VIVALDI—适用于物理、化学和材料科学的热中子劳埃衍射仪
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
G. McIntyre
中科院分区：
文献类型：
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作者：
C. Wilkinson;J. A. Cowan;D. Myles;F. Cipriani;G. McIntyre
VIVALDI是一款基于圆柱形成像板探测器的劳厄衍射仪，可接受各种标准和适应的样品环境，用于物理、化学和材料科学中的快速单晶实验。通过使用具有大立体角探测器和热中子束的单晶劳厄技术，可以在单次曝光中看到小晶胞材料的大体积倒易空间的二维投影。因此，可以在比单色实验短一到两个数量级的时间内获得完整的结构数据，而精度只有适度的损失。大大缩短的数据采集时间允许结构和磁相变-这往往会导致复杂的不可分割的结构-被观察到，并详细遵循作为温度或压力的函数。VIVALDI计划在2001年底前开始日常运作。
Abstract VIVALDI is a Laue diffractometer based on a cylindrical image-plate detector that will accept a variety of standard and adapted sample environments for fast single-crystal experiments in physics, chemistry and materials science. By using the single-crystal Laue technique with a large solid-angle detector and a thermal neutron beam, the two-dimensional projection of a large volume of reciprocal space of small-unit-cell materials can be seen in a single exposure. Complete structural data can thus be obtained in a time shorter by one to two orders of magnitude than for a monochromatic experiment, with only a modest loss in precision. The dramatically shortened data-acquisition time allows structural and magnetic phase transitions—which often result in complex incommensurable structure—to be observed and followed in detail as a function of temperature or pressure. VIVALDI is scheduled to be in routine operation by the end of 2001.