Issue 16, 2013

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

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

Supplementary files

Article information

Article type
Paper
Submitted
11 Dec 2012
Accepted
15 Feb 2013
First published
19 Feb 2013

Phys. Chem. Chem. Phys., 2013,15, 6049-6056

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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