NDLI: New Developments in Pulsed Electron Paramagnetic Resonance : Relaxation Mechanisms of Nitroxide Spin Labels

Content Provider	Semantic Scholar
Author	Mailer, Colin Robinson, Bruce H. Haas, Duncan A.
Copyright Year	2007
Abstract	Recent technical developments in this laboratory in the areas of pulsed Saturation Recovery Electron Paramagnetic Resonance (SR-EPR) and Saturation Recovery Electron-Electron Double Resonance (SR-ELDOR) have enabled experiments with these two techniques to be done with high sensitivity. We have studied the mechanisms of the relaxation rates of spin labels. The electron spin-lattice relaxation rate Tic ' and the nitrogen spinlattice relaxation rate (Tin") of per-deuterated N TEMPOL in glycerol-water solutions have been measured by SR-EPR and SR-ELDOR. The motional range covered is from a few picoseconds to hundreds of nanoseconds and the motion is characterized by simple Brownian dynamics. The dependence of T i e 1 upon the rotational correlation time is explained by a combination of spin rotation and electron -nuclear dipolar coupling mechanisms plus a proton spin diffusion process. Tin-1 is explained by the electron-nuclear dipolar mechanism and proton spin diffusion.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.weizmann.ac.il/ISMAR/sites/ISMAR/files/bulletin/BMR_14_030-034_1992.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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