Abstract

A new experimental technique has been developed to measure directly the rotational rate of a molecule connecting two portions of an electron paramagnetic resonance (EPR) spectrum, by a method which is independent of any factors in the Hamiltonian (such as A or g tensors) or the particular mechanisms of relaxation. Perdeuterated [ 15 N] TEMPOL and CTPO in glycerol-water mixtures and spin-labeled hemoglobin were studied using the time domain technique of pulsed saturation recovery electron double resonance (SR-ELDOR) in the 0.1-10-μs motional time regime

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