ln-phase absorptive In-phase dispersive Antiphase absorptive Antiphase dispersive

which is at the center of a symmetrical multiplet such as a doublet. Chemical shift evolution is the movement of this central position in the x'-y' plane during a delay—for a doublet this position is exactly in the middle of the two magnetization vectors representing the a and j components ("lines") of the doublet. J-coupling evolution is the divergence of the two vectors in a doublet away from this central position during the delay as they rotate at slightly different frequencies. Eventually, they reach the antiphase state and begin to converge again on the other side.

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