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Issue 24, 2017
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Anisotropic longitudinal electronic relaxation affects DNP at cryogenic temperatures

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Abstract

We report the observation of anisotropic longitudinal electronic relaxation in nitroxide radicals under typical dynamic nuclear polarization conditions. This anisotropy affects the efficiency of dynamic nuclear polarization at cryogenic temperatures of 4 K and high magnetic fields of 6.7 T. Under our experimental conditions, the electron paramagnetic resonance spectrum of nitroxides such as TEMPOL (4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl) is only partly averaged by electronic spectral diffusion, so that the relaxation times T1e(ω) vary across the spectrum. We demonstrate how the anisotropy of T1e(ω) can be taken into account in simple DNP models.

Graphical abstract: Anisotropic longitudinal electronic relaxation affects DNP at cryogenic temperatures

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Article information


Submitted
16 May 2017
Accepted
02 Jun 2017
First published
09 Jun 2017

Phys. Chem. Chem. Phys., 2017,19, 16087-16094
Article type
Paper

Anisotropic longitudinal electronic relaxation affects DNP at cryogenic temperatures

E. M. M. Weber, H. Vezin, J. G. Kempf, G. Bodenhausen, D. Abergél and D. Kurzbach, Phys. Chem. Chem. Phys., 2017, 19, 16087
DOI: 10.1039/C7CP03242K

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