Abstract
A free induction signal (FIS) after excitation of a two-level inhomogeneously broadened spin system by a sequence of n electromagnetic pulses of the same duration t1 and with the same intervals τ between them is investigated theoretically and experimentally. It has been established that an FIS develops n coherent oscillations of magnetization, whose phases change in time following definite laws. These oscillations arise after cessation of the nth pulse and terminate successively at times that are multiple of t1, thus increasing the FIS duration. The conclusion has been drawn on the validity of the theorem of coherent transient processes on multipulse excitation of two-level spin systems with a finite inhomogeneous line width. The theoretical results are in fairly good agreement with the experimental data obtained in the NMR of protons in glycerin.
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