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Time domain DNP with the NOVEL sequence.

T V Can1, J J Walish2, T M Swager2

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|August 10, 2015
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Summary
This summary is machine-generated.

Pulsed dynamic nuclear polarization (DNP) using the NOVEL sequence significantly enhances nuclear spin polarization. This method shows high efficiency and potential for improved sensitivity in various DNP applications, even at higher temperatures.

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Area of Science:

  • Magnetic Resonance Spectroscopy
  • Physical Chemistry
  • Materials Science

Background:

  • Dynamic Nuclear Polarization (DNP) enhances NMR sensitivity by transferring polarization from electron spins to nuclear spins.
  • Traditional DNP methods often face limitations at higher magnetic fields and temperatures.
  • Pulsed DNP techniques offer potential advantages over continuous-wave methods.

Purpose of the Study:

  • To investigate the efficiency of a pulsed DNP experiment using the Nuclear Orientation via Electron Spin Locking (NOVEL) sequence.
  • To apply and evaluate the NOVEL DNP method across various sample types and conditions.
  • To compare the performance of pulsed NOVEL DNP with existing DNP mechanisms.

Main Methods:

  • Implementation of a lab frame-rotating frame cross-polarization experiment with electron spin locking fields.
  • Application of the NOVEL sequence at a low magnetic field (0.35 T).
  • Testing on diverse samples: DPNO/BzP single crystal, BDPA/PS, and SA-BDPA/glycerol-water glass.

Main Results:

  • Achieved significant signal enhancements (e.g., ε = 165 in DPNO/BzP, ε = 323 in BDPA/PS).
  • Observed magnetization transfer on the timescale of ~100 ns, indicating strong electron-proton couplings.
  • Demonstrated high efficiency of pulsed NOVEL DNP, surpassing continuous-wave methods in certain aspects.

Conclusions:

  • Pulsed DNP via the NOVEL sequence is a highly efficient method for enhancing nuclear spin polarization.
  • The NOVEL approach shows promise for overcoming limitations of continuous-wave DNP, particularly at higher magnetic fields.
  • Pulsed DNP is a viable technique for applications requiring enhanced sensitivity, including at elevated temperatures.