Transient and Steady-State Overhauser Experiments in the Investigation of Relaxation Processes. Analogies between Chemical Exchange and Relaxation

Abstract

An exposition is given to demonstrate the close analogies that exist between chemical exchange and relaxation, and it is suggested that relaxation processes may be investigated by a procedure completely analogous to the double‐resonance method recently introduced for the study of chemical exchange. A rederivation of the Solomon equations for the time dependence of the longitudinal magnetizations of interacting spins which brings out the dependence of the relaxation times on the relative abundance of the different spins is given. Experimental results on samples of formic acid and acetaldehyde are presented.