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Modified Spin-Echo Method for Measuring Nuclear Relaxation Times

S. Meiboom, Deepak Gill

Abstract

A spin echo method adapted to the measurement of long nuclear relaxation times (T2) in liquids is described. The pulse sequence is identical to the one proposed by Carr and Purcell, but the rf of the successive pulses is coherent, and a phase shift of 90° is introduced in the first pulse. Very long T2 values can be measured without appreciable effect of diffusion.

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Available abstract

Key concepts: Spin echo, Echo (communications protocol), Nuclear magnetic resonance, Pulse sequence, Relaxation (psychology), Pulse (music), Diffusion, Phase (matter)