Two-dimensional NMR spectroscopy


When  : There is no interaction between the field and (they are not in accord) and the precession is kept around the axis Oz.

When  : and are in accordance. Thus the couple applied by modifies the angle of with 0z, and then causes transitions between the magnetic sublevels.

There is resonance. The value of the z magnetization decreases and it appears, in the y direction, the transverse magnetization My.

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