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  Coherence transfer and electron T1-, T2-relaxation in nitroxide spin labels.

Marsh, D. (2017). Coherence transfer and electron T1-, T2-relaxation in nitroxide spin labels. Journal of Magnetic Resonance, 277, 86-94. doi:10.1016/j.jmr.2017.02.006.

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Marsh, D.1, Author           
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1Department of NMR Based Structural Biology, MPI for biophysical chemistry, Max Planck Society, ou_578567              

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Free keywords: Dipole-dipole interaction; Dispersion admixture; Double commutator; EPR; Longitudinal and transverse relaxation; Spin operator; Transverse magnetisation transfer
 Abstract: Abragam's double-commutator spin operator method is used to analyse: 1) electron coherence transfer by intermolecular dipolar interaction between spin-label radicals, and 2) longitudinal and transverse electron spin relaxation by rotational modulation of the Zeeman and nitrogen-hyperfine anisotropies of isolated nitroxide spin labels. Results compatible with earlier treatments by Redfield theory are obtained without specifically evaluating matrix elements. Extension to single-transition operators for isolated nitroxides predicts electron coherence transfer by pseudosecular electron-nuclear dipolar interaction, in the absence of intermolecular dipolar coupling. This explains earlier experimental findings that coherence transfer (specifically dispersion-like distortion of the EPR absorption line shape) does not extrapolate to zero at low concentrations of nitroxide spin labels.

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Language(s): eng - English
 Dates: 2017-02-152017-04
 Publication Status: Issued
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 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.jmr.2017.02.006
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Title: Journal of Magnetic Resonance
Source Genre: Journal
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Pages: - Volume / Issue: 277 Sequence Number: - Start / End Page: 86 - 94 Identifier: -