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Overhauser DNP and EPR in a Mobile Setup: Influence of Magnetic Field Inhomogeneity

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Abstract

Power-dependent Overhauser dynamic nuclear polarization (DNP) enhancements and continuous-wave electron paramagnetic resonance (EPR) spectra of nitroxide radicals were measured in the magnetic field of a mobile Halbach-array permanent magnet and compared with results from a commercially available electromagnet. DNP saturation factors for varying microwave power were obtained from both measurement series and used to investigate how the increased magnetic field inhomogeneity present in the Halbach magnet affects the saturation efficiency. An EPR detection system was designed to allow continuous-wave EPR measurements at microwave power up to 20 W. Our results show that despite the lower magnetic field homogeneity, a Halbach-array magnet can be used for EPR and DNP-enhanced nuclear magnetic resonance of high quality providing almost the same performance as a more homogeneous electromagnet.

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Authors and Affiliations

  1. Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany

    Oliver Neudert, Dmitry Germanovich Zverev, Christian Bauer, Hans Wolfgang Spiess, Dariush Hinderberger & Kerstin Münnemann

  2. Institute of Physics, University of Mainz, Staudingerweg 7, 55099, Mainz, Germany

    Peter Blümler

Authors
  1. Oliver Neudert
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  2. Dmitry Germanovich Zverev
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  3. Christian Bauer
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  4. Peter Blümler
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  5. Hans Wolfgang Spiess
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  6. Dariush Hinderberger
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  7. Kerstin Münnemann
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Corresponding author

Correspondence to Kerstin Münnemann.

Electronic supplementary material

Below is the link to the electronic supplementary material.

Online Resource 1 Setup of another experiment in our group where the Halbach magnet was brought close to a 20 cm bore 4.7T MRI magnet.

Online Resource 2 (a) Temperature-dependent measurement of the longitudinal (squares) and transversal (circles) nuclear relaxation time for a 2.5 mM aqueous solution of TEMPOL and spline interpolation of the T 2,n data (line). (b) Sample heating resulting from pulsed microwave irradiation with a power of 0.7 W in dependence of the irradiation time (symbols) and the best fit following an exponential saturation behavior (line). The maximum temperature increase of 30.5 K (not shown) was obtained from continuous microwave irradiation for more than 30 s and was used to define the corresponding fit parameter. A time constant of 2.16±0.03 s was obtained from the fit.

Online Resource 3 Microwave power dependent absorption amplitude coefficients A a,corr (symbols) and best fits (lines) obtained from equation 15.

Online Resource 4 Parameters of the fits shown in Online Resource 3.

Supplementary material 1 (PDF 634 kb)

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Neudert, O., Zverev, D.G., Bauer, C. et al. Overhauser DNP and EPR in a Mobile Setup: Influence of Magnetic Field Inhomogeneity. Appl Magn Reson 43, 149–165 (2012). https://doi.org/10.1007/s00723-012-0347-4

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  • DOI: https://doi.org/10.1007/s00723-012-0347-4

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