The half-wave triplet pulse sequence for determination of longitudinal relaxation rates of single line spectra

Robert J. Kurland, Rob G. Parrish

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Abstract

A modified pulse triplet sequence has been developed for the measurement of longitudinal relaxation rates, 1/T1. 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 δt-2τ between successive triplets, is no longer required. Values of 1/T1 derived from triplet measurements and a Carr-Purcell spin echo measurement of 1/T2 on test samples of aqueous polymethacrylate and copper sulfate are in good agreement with values of 1/T1 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 T2 are required for the determination of 1/T1n this method, compared to at least n repetitions (for n points) in the Carr-Purcell 180°-t-90° method.

Original languageEnglish (US)
Pages (from-to)295-300
Number of pages6
JournalJournal of Magnetic Resonance (1969)
Volume17
Issue number3
DOIs
StatePublished - Jan 1 1975

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