Issue 22, 2010
From the journal:

Physical Chemistry Chemical Physics

Liquid state DNP using a 260 GHz high power gyrotron

Vasyl Denysenkov,a   Mark J. Prandolini,a   Marat Gafurov,a   Deniz Sezer,a   Burkhard Endewarda  and  Thomas F. Prisner*a  

* Corresponding authors

a Institute of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic Resonance, Goethe University Frankfurt, Germany
E-mail: Prisner@chemie.uni-frankfurt.de

Abstract

Dynamic nuclear polarization (DNP) at high magnetic fields (9.2 T, 400 MHz 1H NMR frequency) requires high microwave power sources to achieve saturation of the EPR transitions. Here we describe the first high-field liquid-state DNP results using a high-power gyrotron microwave source (20 W at 260 GHz). A DNP enhancement of −29 on water protons was obtained for an aqueous solution of Fremy's Salt; in comparison the previous highest value was −10 using a solid-state microwave power source (maximum power 45 mW). The increased enhancements are partly due to larger microwave saturation and elevated sample temperature. These experimentally observed DNP enhancements, which by far exceed the predicted values extrapolated from low-field DNP experiments, demonstrate experimentally that DNP is possible in the liquid state also at high magnetic fields.

Graphical abstract: Liquid state DNP using a 260 GHz high power gyrotron

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Article information

DOI
https://doi.org/10.1039/C003697H
Article type
Paper
Submitted
26 Feb 2010
Accepted
27 Apr 2010
First published
11 May 2010

Phys. Chem. Chem. Phys., 2010,12, 5786-5790

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Liquid state DNP using a 260 GHz high power gyrotron

V. Denysenkov, M. J. Prandolini, M. Gafurov, D. Sezer, B. Endeward and T. F. Prisner, Phys. Chem. Chem. Phys., 2010, 12, 5786 DOI: 10.1039/C003697H

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