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Ramped-amplitude NOVEL.

T V Can1, R T Weber2, J J Walish3

  • 1Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

The Journal of Chemical Physics
|April 24, 2017
PubMed
Summary
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We developed a ramped-amplitude nuclear orientation via electron spin locking (RA-NOVEL) technique to enhance dynamic nuclear polarization (DNP) efficiency by up to 1.6 times. This pulsed DNP method uses modulated microwave pulses for improved performance in nuclear magnetic resonance studies.

Area of Science:

  • Magnetic Resonance
  • Physical Chemistry
  • Spectroscopy

Background:

  • Pulsed dynamic nuclear polarization (DNP) enhances NMR sensitivity.
  • Nuclear Orientation via Electron Spin Locking (NOVEL) is a DNP technique.
  • Optimizing DNP efficiency is crucial for various applications.

Purpose of the Study:

  • To introduce and evaluate a ramped-amplitude NOVEL (RA-NOVEL) sequence for pulsed DNP.
  • To investigate the impact of microwave pulse modulation on DNP efficiency.
  • To compare RA-NOVEL with constant-amplitude NOVEL (CA-NOVEL).

Main Methods:

  • Implementation of a RA-NOVEL sequence using a fast arbitrary waveform generator (AWG).
  • Utilizing samples doped with narrow-line radicals (BDPA, SA-BDPA, trityl-OX063).

Related Experiment Videos

  • Time-domain DNP experiments with modulated microwave pulses.

    • Main Results:

    • RA-NOVEL improved DNP efficiency by up to 1.6 times compared to CA-NOVEL.
    • Optimal ramp amplitude and mixing time were identified for different radicals.
    • Tangent ramp profiles showed superiority over linear ramps at shorter mixing times.

    Conclusions:

    • RA-NOVEL is an effective method for enhancing pulsed DNP efficiency.
    • Precise modulation of microwave pulses is key for optimizing DNP experiments.
    • AWG provides an instrumental solution for implementing modulated microwave pulses in DNP.