Relaxation Effects in Nuclear Magnetic Double Resonance

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Abstract
A general method, based on the density-matrix formalism of magnetic resonance given by Bloch and using the notational simplicity of Redfield, has been described for analyzing relaxation and coherence effects in nuclear magnetic double resonance. The method consists of transforming the equation of motion of the spin density matrix to a coordinate system rotating at the angular frequency of the strong irradiating field. The effect of the strong field is then calculated in the absence of the observing field. The effect of the observing field is calculated by obtaining a steady-state solution of the equation of motion. The method is briefly illustrated for the case of a single nucleus of spin ½.