Abstract

The T 1 value obtained from a polycrystalline sample by using the steady-state pulse method disagrees from the one obtained by the two-pulse method. The formula used in order to fit the experimental data from the steady-state pulse method was found to be inexact. This work consideres the effect of the R.F. pulse on a sample with a general angular distribution of the microcrystals. A master formula to fit the experimental data from the steady-state pulses is obtained. From this master formula we deduce the expressions to fit the experimenta points obtained from steady-state pulses in several possibles types of samples, from monocrystals with a unique angular direction for all the microcrystals to the polycrystals where the microcrystals are random distributed. The experimental arrangement to obtain a well-approximated value of T 1 is also given from the above mentionated formulas.

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