Abstract
The formulation by Dattagupta of the strong-collision model, describing the effect on the perturbation function,G 2(t) by the isotropic tumbling of an electric field gradient, is generalized to electric field gradients with no axial symmetry. The effect on the perturbation function by strong collisions is compared to the effect of rotational diffusion in the adiabatic limit. The comparison is carried out for decays with an intermediate state of spin 5/2 and for non-axially symmetric electric field gradients. It shows that the strong-collision model can be used for interpretation of PAC spectra of molecules with correlation times between the adiabatic and the fast relaxation limits. The strongcollision model is then used to determine the rotational diffusion of the cadmium substituted copper, zinc superoxide dismutase at 3°C and 25°C from111mCd TDPAC spectra. For these analyses, the model is incorporated into a conventional least-squares fitting routine.
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Danielsen, E., Bauer, R. Analysis of perturbed angular correlation spectra of metal ions bound to proteins with rotational correlation times in the intermediate region. Hyperfine Interact 62, 311–324 (1991). https://doi.org/10.1007/BF02397711
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DOI: https://doi.org/10.1007/BF02397711