Abstract
A modified pulse triplet sequence has been developed for the measurement of longitudinal relaxation rates, 1/ T 1. The analysis of this “half-wave” triplet method takes account of transverse relaxation occurring during the triplet, so that the approximation employed in previous use of the triplet sequence, viz., that the interval τ between component pulses of the triplet be much less than the interval δ t-2τ between successive triplets, is no longer required. Values of 1/ T 1 derived from triplet measurements and a Carr-Purcell spin echo measurement of 1/ T 2 on test samples of aqueous polymethacrylate and copper sulfate are in good agreement with values of 1/ T 1 obtained from conventional Carr-Purcell 180°- t-90° measurements. The half-wave triplet sequence would be useful for those cases where a single line is present in the spectrum: two repetitions of the triplet sequence to obtain n points on a magnetization recovery curve and a determination of T 2 are required for the determination of 1/ T 1n this method, compared to at least n repetitions (for n points) in the Carr-Purcell 180°- t-90° method.
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