PULSED FIELD GRADIENT NUCLEAR MAGNETIC-RESONANCE AS A PROBE OF LIQUID-STATE MOLECULAR-ORGANIZATION
PULSED FIELD GRADIENT NUCLEAR MAGNETIC-RESONANCE AS A PROBE OF LIQUID-STATE MOLECULAR-ORGANIZATION
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DOI：
10.1071/ph840539
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发表时间：
1984-01-01
期刊：
影响因子：
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通讯作者：
CALLAGHAN, PT
中科院分区：
文献类型：
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作者：
CALLAGHAN, PT
在核磁共振实验上施加磁场梯度，通过内部原子核(通常是质子)的拉莫尔频率为分子赋予空间标签。通过检测在梯度脉冲存在的情况下执行的自旋回波实验中的相干性损失，可以提供频率分布变化的灵敏测量。这里，可以在脉冲分离所给出的持续时间内测量分子位移。脉冲场梯度核磁共振(PFG核磁共振)采用几十毫秒的时间间隔，具有100纳米量级的位移灵敏度。
The imposition of magnetic field gradients on a nuclear magnetic resonance experiment imparts a spatial tag to the molecules via the Larmor frequencies of the nuclei (commonly protons) within. A sensitive measure of changes in the frequency distribution is afforded by detecting the loss of phase coherence in a spin-echo experiment performed in the presence of gradient pulses. Here the molecular displacements may be measured over the duration given by the pulse separation. Pulsed field gradient nuclear magnetic resonance (PFGNMR) employs timesca1es of tens of milliseconds and has a displacement sensitivity of the order 100 nm.