Pulsed gradient NMR probes for solid state studies.
Pulsed gradient NMR probes for solid state studies.
复制标题
DOI：
10.1006/jmre.1998.1408
复制
发表时间：
1998-05
影响因子：
2.2
通讯作者：
W. Zhang;D. Cory
中科院分区：
文献类型：
--
作者：
W. Zhang;D. Cory
最近介绍的偶极耦合固体中自旋动力学的空间特性研究依赖于具有强磁场梯度的核磁共振探针来创建周期从1微米到1纳米的空间磁化光栅。测量是作为散射实验进行的，其中自旋相干的空间位移记录为磁化光栅的相移或衰减。最近我们利用这些技术对单晶CaF2中的自旋扩散速率进行了直接测量。本文讨论了强脉冲梯度核磁共振探针的设计。设计并构建了3组梯度线圈，线圈常数分别为0.32、0.67和4.15 T/m/A。当脉冲电流源提供高达300a驱动时，分别产生100t /m、200t /m和600t /m的脉冲梯度。这些设计充分描述，以及线圈加热和探头稳定性的实际问题。
Recently introduced studies of the spatial characteristics of spin dynamics in dipolarly coupled solids rely upon NMR probes with strong magnetic field gradients to create spatial magnetization gratings with periods of from 1 micron to 1 nm. The measurements are carried out as scattering experiments where the spatial displacement of spin coherence is recorded as a phase shift or attenuation of the magnetization grating. Recently we have employed these techniques to make a direct measurement of the spin diffusion rate in single crystal CaF2. Here we discuss designs for strong pulsed gradient NMR probes. Three gradient coil sets were designed and constructed, with coil constants of 0.32, 0.67, and 4.15 T/m/A. When driven by a pulsed current source that provides up to 300 A, pulsed gradients of 100, 200, and 600 T/m, respectively, were generated. These designs are fully described, along with practical issues of coil heating and probe stability.