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Issue 16, 2013
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Liquid state DNP of water at 9.2 T: an experimental access to saturation

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Abstract

We have performed liquid state (“Overhauser”) Dynamic Nuclear Polarization (DNP) experiments at high magnetic field (9.2 T, corresponding to 260 GHz EPR and 400 MHz 1H-NMR resonance frequency) on aqueous solutions of 14N-TEMPOL nitroxide radicals. Integrated signal enhancements exceeding −80 were observed for the water protons at microwave superheated temperatures (160 °C) and still −14 at ambient temperatures (45 °C) relevant to biological applications. Different contributions contributing to the DNP enhancement such as saturation factor, leakage factor and sample temperature under microwave irradiation could be determined independently for a high spin concentration of 1 M, allowing the calculation of the coupling factors as a function of temperature and a quantitative comparison of this parameter with values derived from field dependent relaxation measurements or predictions from MD simulation.

Graphical abstract: Liquid state DNP of water at 9.2 T: an experimental access to saturation

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Publication details

The article was received on 11 Dec 2012, accepted on 15 Feb 2013 and first published on 19 Feb 2013


Article type: Paper
DOI: 10.1039/C3CP44461A
Citation: Phys. Chem. Chem. Phys., 2013,15, 6049-6056

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    Liquid state DNP of water at 9.2 T: an experimental access to saturation

    P. Neugebauer, J. G. Krummenacker, V. P. Denysenkov, G. Parigi, C. Luchinat and T. F. Prisner, Phys. Chem. Chem. Phys., 2013, 15, 6049
    DOI: 10.1039/C3CP44461A

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