Fast field-cycling nuclear magnetic resonance spectrometer
Fast field-cycling nuclear magnetic resonance spectrometer
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DOI：
10.1063/1.1147024
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发表时间：
1996-06-01
影响因子：
1.6
通讯作者：
Brown, MF
中科院分区：
文献类型：
--
作者：
Job, C;Zajicek, J;Brown, MF
我们在这里描述的设计和建设的现代化，国家的最先进的核磁共振（NMR）场循环仪器。可以测量液体和固体样品的傅里叶变换NMR谱，并且可以在从0到2 T的宽磁场强度范围内研究自旋-晶格弛豫时间（T-1 Z）。该仪器是基于现有的个人计算机为基础的NMR光谱仪[C。乔布河M. Pearson和M. F. Brown，Rev. Sci.仪器65，3354（1994）]，其已经扩展成完全计算机控制的场循环仪器。磁场循环是通过利用快速开关晶闸管和基于Redfield能量存储概念的存储电容器以电子方式实现的。独特的设计方面包括磁场循环磁体，可达到高达2 T的磁场;基于个人计算机的NMR光谱仪和相关的波形电子设备;以及使用市售的脉宽调制开关电流放大器，具有低内部功耗和快速电流建立时间。使用这种新技术，T-1 Z弛豫时间短至1毫秒，可以很容易地测量。(C)1996年美国物理学会。
We describe here the design and construction of a modern, state-of-the-art nuclear magnetic resonance (NMR) field-cycling instrument. Fourier transform NMR spectra of both liquid and solid samples can be measured, and spin-lattice relaxation times (T-1Z) investigated over a broad range of magnetic field strengths ranging from 0 to 2 T. The instrument is based upon an existing personal computer-based NMR spectrometer [C. Job, R. M. Pearson, and M. F. Brown, Rev. Sci. Instrum. 65, 3354 (1994)] which has been expanded into a fully computer-controlled field-cycling instrument. The magnetic field cycling is accomplished electronically by utilizing fast switching thyristors and a storage capacitor based on the Redfield energy storage concept. Unique aspects of the design include the field-cycling magnet, which can reach fields as high as 2 T; the personal computer-based NMR spectrometer and associated waveform electronics; and the use of a commercially available pulse width modulation switching current amplifier, having low internal power dissipation and a fast current settling time. Using this new technology T-1Z relaxation times as short as 1 ms can be readily measured. (C) 1996 American Institute of Physics.