Gradient-selected experiments

Because the sum is not equal to zero, we end up with twisted coherence and no signal in the receiver. We call this a gradient-selected experiment because the gradients are being used to specifically refocus coherence in the desired coherence transfer pathway (XH SQC -> 13C SQC) and to reject all others. In Chapter 10, we will develop the idea of coherence order in a more precise manner, and we will see that coherence order can be either positive or negative. 

As shown by Check it 2.3.3.12 and 2.3.3.13 the H signals from the isotopomers can be successfully suppressed using either phase cycling or gradient selected experiment. However using gradient selection this suppression is possible in a single... 

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