Cross relaxation in nitroxide spin labels.

Marsh, D.

doi:10.1016/j.jmr.2016.09.014

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Cross relaxation in nitroxide spin labels.

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Marsh, D.
Research Group of Protein Structure Determination using NMR, MPI for biophysical chemistry, Max Planck Society;

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Citation

Marsh, D. (2016). Cross relaxation in nitroxide spin labels. Journal of Magnetic Resonance, 272, 172-180. doi:10.1016/j.jmr.2016.09.014.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-116F-5

Abstract

Cross relaxation, and m(1)-dependence of the intrinsic electron spin-lattice relaxation rate We, are incorporated explicitly into the rate equations for the electron-spin population differences that govern the saturation behaviour of N-14- and N-15-nitroxide spin labels. Both prove important in spin-label EPR and ELDOR, particularly for saturation recovery studies. Neither for saturation recovery, nor for CW-saturation EPR and CW-ELDOR, can cross relaxation be described simply by increasing the value of We, the intrinsic spin-lattice relaxation rate. Independence of the saturation recovery rates from the hyperfine line pumped or observed follows directly from solution of the rate equations including cross relaxation, even when the intrinsic spin-lattice relaxation rate We is m(1)-dependent.