Abstract
A density matrix analysis of the effects of phase modification in the “nonideal” inversion-recovery pulse sequence upon the apparent magnetization recovery is presented. The apparent magnetization recovery is, in general, nonexponential, depending on the ratio T 1 T 2 ∗ , the relative pulse phases in the inversion-recovery sequence, the off-resonance frequency, the observation direction, the radiofrequency field inhomogeneity, phase-glitch effect, and/or inaccurate settings of the pulse lengths. The interference effects produced by transverse magnetization in the case of T 1 measurements by the inversion-recovery pulse sequence or saturation recovery pulse sequence in the high-resolution NMR spectra can be eliminated successively using the coincident phase and antiphase pulse sequences. This technique has the advantage of simplicity and allows the maximum resolution in the partly relaxed spectrum.
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