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The usual approach to considerations of apin relaxation and frequency shiftsdue to fluctuating fields is through the density matrix Slichter. Here we treatthe problem of the influence of fluctuating fields on a spin 1/2 system basedon direct solution of the Schroedinger equation in contrast to the usualtreatment. Our results are seen to be in agreement with the known results inthe literature McGregor, Slichter, Red2, CSH, as they must, but our derivationdirectly from the Schroedinger equation allows us to see the role of thenecessary assumptions in a somewhat clearer way.

Spin 1/2 systems perturbed by fluctuating, arbitrary fields; relaxation and frequency shifts, a new approach to Redfield theory