Applied Magnetic Resonance

, Volume 43, Issue 1–2, pp 149–165 | Cite as

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

  • Oliver Neudert
  • Dmitry Germanovich Zverev
  • Christian Bauer
  • Peter Blümler
  • Hans Wolfgang Spiess
  • Dariush Hinderberger
  • Kerstin MünnemannEmail author


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.


Electron Paramagnetic Resonance Electron Paramagnetic Resonance Spectrum Microwave Power Dynamic Nuclear Polarization Electron Paramagnetic Resonance Measurement 
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Supplementary material

723_2012_347_MOESM1_ESM.pdf (635 kb)
Supplementary material 1 (PDF 634 kb)


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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Oliver Neudert
    • 1
  • Dmitry Germanovich Zverev
    • 1
  • Christian Bauer
    • 1
  • Peter Blümler
    • 2
  • Hans Wolfgang Spiess
    • 1
  • Dariush Hinderberger
    • 1
  • Kerstin Münnemann
    • 1
    Email author
  1. 1.Max Planck Institute for Polymer ResearchMainzGermany
  2. 2.Institute of PhysicsUniversity of MainzMainzGermany

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