Abstract
A theory of saturation recovery EPR has been developed to explore the very slow motional regime using the two-jump model. The EPR signal is predicted to be a biexponential curve for this motional model. From the two exponential decay constants λ1 and λ2 the exchange rate constant k can be calculated by the simple formula: k= 1/2 (λ2−λ1). Experimental results obtained from slowly tumbling 15N-TEMPOL in sec-butylbenzene have been fitted to the two-jump model. Even though this is a crude attempt, good agreement has been observed between the two-jump rate constant (k=0.043 μs−1) and the isotropic Brownian diffusion constant calculated from the hydrodynamic Debye expression (D=0.051 μs−1).
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