Callaghan PT, Komlosh ME, Nyden M
Department of Physics, Massey University, Palmerston North, New Zealandand.
J Magn Reson. 1998 Jul;133(1):177-82. doi: 10.1006/jmre.1998.1424.
A description is given of pulsed gradient spin echo (PGSE) NMR experiments in which large pulsed magnetic field gradients may be required. The design contraints are discussed and, in particular, the problem of the use of large pulsed magnetic field gradients in conjunction with large polarizing fields is considered. Issues addressed concern probe mechanical assembly, current supply requirements, and pulse shape design. We describe a quadrupolar coil with a gradient amplitude of 1.65 T m-1 A-1 which has been used successfully up to a maximum gradient of around 40 T m-1. A diffusion coefficent of 7.5 x 10(-16) m2 s-1 has been measured using this system, the lowest yet achieved by PGSE NMR methods. Copyright 1998 Academic Press.
本文描述了脉冲梯度自旋回波（PGSE）核磁共振实验，这类实验可能需要大的脉冲磁场梯度。文中讨论了设计限制，尤其考虑了大脉冲磁场梯度与大极化场结合使用的问题。涉及的问题包括探头机械组装、电流供应要求以及脉冲形状设计。我们描述了一种梯度幅度为1.65 T m-1 A-1的四极线圈，该线圈已成功应用于高达约40 T m-1的最大梯度。使用该系统测量到扩散系数为7.5×10(-16) m2 s-1，这是PGSE NMR方法迄今所达到的最低值。版权所有1998年，学术出版社。
