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Efficient 263 GHz magic angle spinning DNP at 100 K using solid-state diode sources.

Ivan V Sergeyev1, Fabien Aussenac2, Armin Purea3

  • 1Bruker BioSpin Corp., 15 Fortune Drive, Billerica, MA, 01821, USA.

Solid State Nuclear Magnetic Resonance
|April 10, 2019
PubMed
Summary
This summary is machine-generated.

New solid-state diode sources enable low-power Dynamic Nuclear Polarization (DNP) experiments at 263 GHz, achieving significant signal enhancements. These diode sources offer advantages over traditional vacuum tubes, promising wider DNP adoption.

Keywords:
DNPDynamic nuclear polarizationMicrowaveMillimeter waveNMRNMR probesSolid state NMRSolid-state diode

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Area of Science:

  • Solid-state physics
  • Magnetic Resonance Spectroscopy
  • Nuclear Magnetic Resonance (NMR)

Background:

  • Dynamic Nuclear Polarization (DNP) enhances Nuclear Magnetic Resonance (NMR) sensitivity.
  • High-power vacuum tube devices like gyrotrons have traditionally been used for DNP experiments.
  • Limitations of vacuum tubes include size, cost, and maintenance requirements.

Purpose of the Study:

  • To introduce and evaluate novel, high-frequency solid-state diode sources for low-power DNP experiments.
  • To assess the performance of these diode sources at 263 GHz.
  • To compare the advantages of solid-state diodes with traditional vacuum tube devices in DNP.

Main Methods:

  • Development of solid-state diode sources operating at 263 GHz.
  • Optimization of stator design for improved millimeter-wave coupling to NMR samples.
  • Conducting low-power DNP experiments using the new diode sources and optimized setup.

Main Results:

  • Achieved signal enhancements up to 120 with 250 mW output power on standard samples at 263 GHz.
  • This enhancement represents approximately one-third of the maximal enhancement obtained with high-power gyrotrons.
  • Solid-state diode sources demonstrated pure mode emission, rapid frequency sweeping, reproducible power, and excellent stability.

Conclusions:

  • Solid-state diode sources are a viable and advantageous alternative to vacuum tube devices for DNP.
  • Their compact size, lower operational cost, and ease of maintenance facilitate wider DNP application.
  • Further improvements in output power are anticipated, positioning solid-state diodes for significant contributions to DNP advancements.