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- W4323353275 abstract "Saturation-recovery (SR)-EPR can determine electron spin-lattice relaxation rates in liquids over a wide range of effective viscosity, making it especially useful for biophysical and biomedical applications. Here, I develop exact solutions for the SR-EPR and SR-ELDOR rate constants of 14N-nitroxyl spin labels as a function of rotational correlation time and spectrometer operating frequency. Explicit mechanisms for electron spin-lattice relaxation are: rotational modulation of the N-hyperfine and electron-Zeeman anisotropies (specifically including cross terms), spin-rotation interaction, and residual frequency-independent vibrational contributions from Raman processes and local modes. Cross relaxation from mutual electron and nuclear spin flips, and direct nitrogen nuclear spin-lattice relaxation, also must be included. Both the latter are further contributions from rotational modulation of the electron-nuclear dipolar interaction (END). All the conventional liquid-state mechanisms are defined fully by the spin-Hamiltonian parameters; only the vibrational contributions contain fitting parameters. This analysis gives a firm basis for interpreting SR (and inversion recovery) results in terms of additional, less standard mechanisms." @default.
- W4323353275 created "2023-03-08" @default.
- W4323353275 creator A5062821743 @default.
- W4323353275 date "2023-05-01" @default.
- W4323353275 modified "2023-09-30" @default.
- W4323353275 title "Rate constants for saturation-recovery EPR and ELDOR of 14N-Spin labels" @default.
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- W4323353275 doi "https://doi.org/10.1016/j.jmr.2023.107414" @default.
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