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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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High-frequency high-power DNP/EPR spectrometer operating at 7 T magnetic field.

Alexander A Nevzorov1, Antonin Marek1, Sergey Milikisiyants1

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Journal of Magnetic Resonance (San Diego, Calif. : 1997)
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Summary

High-power millimeter-wave pulses were generated for pulse Dynamic Nuclear Polarization (DNP) using an Extended Interaction Klystron (EIK) amplifier, significantly enhancing NMR spectroscopy capabilities.

Keywords:
Dynamic nuclear polarizationElectron spin echoesExtended interaction klystronQuasiopticsSolid-state mm-wave devices

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Area of Science:

  • Magnetic Resonance Spectroscopy
  • Physical Chemistry
  • Materials Science

Background:

  • Pulse Dynamic Nuclear Polarization (DNP) requires high-power, coherent millimeter-wave (mm-wave) pulses.
  • Existing technology limits the generation of mm-waves at frequencies relevant to high-resolution Nuclear Magnetic Resonance (NMR) spectrometers.

Purpose of the Study:

  • To develop and integrate a high-power mm-wave pulse amplifier for pulse DNP.
  • To enhance the performance of a 7 Tesla (T) NMR/DNP/Electron Paramagnetic Resonance (EPR) spectrometer.
  • To characterize the performance of the upgraded system for various DNP experiments.

Main Methods:

  • Integration of a custom-built Extended Interaction Klystron (EIK) pulse amplifier (140 W at 197.8 GHz) with a 7 T NMR/DNP/EPR spectrometer.
  • Utilizing a Thomas Keating, Ltd. quasioptical bridge and a homebuilt DNP probe with photonic bandgap (PBG) resonators.
  • Employing three-pulse electron spin echo nutation experiments to measure electronic B1e fields.
  • Conducting "gated" mode DNP experiments with 20 μs mm-wave pulses and continuous wave (CW) DNP experiments.

Main Results:

  • Achieved <9 ns π/2 pulses at ~50 W EIK output with a PBG resonator quality factor of Q≈300.
  • Demonstrated solid-effect DNP with 13C gains up to 20 for polystyrene-BDPA samples.
  • Observed comparable 13C enhancement in gated DNP mode for HPHT diamond as in CW mode, with no DNP for polystyrene-BDPA in CW mode.
  • Achieved 31P Overhauser DNP enhancements of 7-14 in liquid samples.

Conclusions:

  • The integration of a high-power EIK amplifier and PBG resonators significantly advances pulse DNP capabilities.
  • The upgraded spectrometer enables efficient DNP experiments in both gated and CW modes for various samples.
  • The system demonstrates versatility for solid-state and liquid-state DNP applications, enhancing NMR sensitivity.