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首页> 外文期刊>Journal of magnetic resonance >Coherence Selection and Excitation Sculpting Using RF-Gradients in Selective 1D Experiments and Nonselective 2D Experiments
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Coherence Selection and Excitation Sculpting Using RF-Gradients in Selective 1D Experiments and Nonselective 2D Experiments

机译:选择性1D实验和非选择性2D实验中使用RF梯度进行相干选择和激励雕刻

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摘要

The B_0 gradient pulses can be replaced with long high-power pulses (RF-gradients) in z-rotation composite sandwiches. By doing this, practically all B_0 gradient-based pulse sequences can be performed with instruments lacking a field gradient accessory. We have implemented RF-gradients into selective 1D and nonselective 2D TOCSY and NOESY experiments. The spectral quality obtained with the RF-gradient method was comparable to that of the B_0 method for small- to medium-sized molecules. There are also some advantages in using RF-gradients instead of B_0 gradients. There is practically no shift or coupling evolution during RF-gradient pulses. his may be significant in some experiments.
机译:B_0梯度脉冲可以用z旋转复合材料三明治中的长高功率脉冲(RF梯度)代替。这样,几乎所有基于B_0梯度的脉冲序列都可以使用缺少场梯度附件的仪器来执行。我们已将RF梯度实现为选择性1D和非选择性2D TOCSY和NOESY实验。对于中小分子,使用RF梯度方法获得的光谱质量与B_0方法相当。使用RF梯度代替B_0梯度也有一些优点。在RF梯度脉冲期间,实际上没有移位或耦合演化。在某些实验中他的意义可能很大。

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