Pulse techniques for CIDNP
Pulse techniques for CIDNP
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CIDNP 脉冲技术
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
M. Goez
中科院分区：
文献类型：
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作者：
M. Goez
讨论了脉冲和傅立叶变换核磁共振谱仪测量化学诱导动态核极化的特点。如果以这种方式完成检测，就有可能进行新的实验。首先，利用脉冲技术可以分离CIDNP的网络效应和多路效应。其次，动态测量（“flash”CIDNP）可以在亚微秒范围内进行时间分辨率。第三，伪平稳实验允许记录与时间无关的CIDNP光谱，这些光谱不受产物中核自旋弛豫的影响，并且具有改进的信噪比，同时保持对不变背景磁化的良好抑制。最后，利用相干转移技术可以观察到产物中非极化核的信号。
The peculiarities of measurements of chemically induced dynamic nuclear polarization (CIDNP) with pulsed and Fourier transform NMR spectrometers are discussed. If detection is accomplished in this way, new classes of experiments become possible. First, CIDNP net and multiplet effects can be separated by pulse techniques. Second, kinetic measurements (“flash” CIDNP) can be performed with a time resolution in the submicrosecond range. Third, pseudostationary experiments allow recording of time-independent CIDNP spectra that are free from the effects of nuclear spin relaxation in the products and that possess improved signal-to-noise ratios while maintaining excellent suppression of unchanging background magnetization. Finally, signals of unpolarized nuclei in the products can be made observable by means of coherence transfer techniques.