NMR measurements of diffusion in concentrated samples: avoiding problems with radiation damping
NMR measurements of diffusion in concentrated samples: avoiding problems with radiation damping
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DOI：
10.1007/s00216-003-2387-y
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发表时间：
2004-03-01
影响因子：
4.3
通讯作者：
Morris, GA
中科院分区：
文献类型：
--
作者：
Connell, MA;Davis, AL;Morris, GA
脉冲梯度自旋回波核磁共振通常是液体样品扩散测量的首选方法。然而，对于现代高场仪器，由于辐射衰减的存在，当它应用于质子浓度非常高的样品时，可能会出现严重的问题。通过适当地选择实验参数，特别是使用第一脉冲具有减小翻转角的修改的受刺激回波脉冲序列，这些问题可以大大减少。
Pulsed field gradient spin echo NMR is generally the method of choice for diffusion measurements on liquid samples. With modem high field instruments, however, severe problems can arise when it is applied to samples with very high proton concentrations because of the presence of radiation damping. The problems may be greatly reduced by a suitable choice of experimental parameters, in particular the use of modified stimulated echo pulse sequences with a reduced flip angle for the first pulse.