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- W2583089901 abstract "Electron paramagnetic resonance (EPR) spectra of radicals in solution depend on their relative motion, which modulates the Heisenberg spin exchange and dipole–dipole interactions between them. To gain information on radical diffusion from EPR spectra demands both reliable spectral fitting to find the concentration coefficients of EPR parameters and valid expressions between the concentration and diffusion coefficients. Here, we measured EPR spectra of the 14N- and 15N-labeled perdeuterated TEMPONE radicals in normal and supercooled water at various concentrations. By fitting the EPR spectra to the functions based on the modified Bloch equations, we obtained the concentration coefficients for the spin dephasing, coherence transfer, and hyperfine splitting parameters. Assuming the continuous diffusion model for radical motion, the diffusion coefficients of radicals were calculated from the concentration coefficients using the standard relations and the relations derived from the kinetic equations for the spin evolution of a radical pair. The latter relations give better agreement between the diffusion coefficients calculated from different concentration coefficients. The diffusion coefficients are similar for both radicals, which supports the presented method. They decrease with lowering temperature slower than is predicted by the Stokes–Einstein relation and slower than the rotational diffusion coefficients, which is similar to the diffusion of water molecules in supercooled water." @default.
- W2583089901 created "2017-02-03" @default.
- W2583089901 creator A5027143449 @default.
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- W2583089901 date "2017-05-16" @default.
- W2583089901 modified "2023-09-25" @default.
- W2583089901 title "Continuous Diffusion Model for Concentration Dependence of Nitroxide EPR Parameters in Normal and Supercooled Water" @default.
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- W2583089901 doi "https://doi.org/10.1021/acs.jpcb.7b02550" @default.
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