Abstract
Errors which may occur in the measurement of transverse relaxation rates in liquids by wideband multiple pulse techniques are described. Numerical analysis of Bloch equations is used to evaluate the effects of imperfect pulses, and results of pulse imperfections are demonstrated experimentally. Effects of field-frequency instability and of diffusion combined with external field gradients are discussed. Methods for avoiding several of these errors are described and applied to the measurement of T 2 for degassed benzene. It is experimentally demonstrated that if certain criteria are met, measurements of T 2 with accuracy of ±1–2% are feasible.
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