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Updated: Jun 8, 2025

Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
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Dynamic Nuclear Polarization with P1 Centers in Diamond.

Ravi Shankar Palani1, Michael Mardini1, Yifan Quan1

  • 1Department of Chemistry and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

The Journal of Physical Chemistry Letters
|November 8, 2024
PubMed
Summary
This summary is machine-generated.

Substitutional nitrogen impurities (P1 centers) in diamond enable dynamic nuclear polarization (DNP), significantly enhancing 13C spin signals. This study demonstrates a 550-fold enhancement at room temperature, crucial for diamond-based technologies.

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Area of Science:

  • Solid-state physics
  • Quantum sensing
  • Materials science

Background:

  • P1 centers in diamond possess unpaired electrons capable of mediating dynamic nuclear polarization (DNP).
  • Microwave-driven DNP can enhance nuclear spin polarization, improving signal detection in magnetic resonance techniques.

Purpose of the Study:

  • To investigate dynamic nuclear polarization (DNP) of bulk 13C spins in micrometer-sized P1 diamond particles.
  • To explore the mechanisms and efficiency of DNP enhancement under varying experimental conditions.

Main Methods:

  • Utilized micrometer-sized P1 diamond particles with substitutional nitrogen impurities.
  • Employed microwave-driven dynamic nuclear polarization (DNP) at room temperature and 9 T magnetic field (250 GHz).
  • Investigated DNP dependence on sample spinning frequency and microwave irradiation using continuous wave and frequency-swept methods.

Main Results:

  • Achieved a 550-fold enhancement of bulk 13C spins at room temperature.
  • Demonstrated a significant 13C signal enhancement (ε = 270) with 160 mW microwave power.
  • Observed that DNP enhancements increase with magic angle spinning (MAS) frequency.

Conclusions:

  • P1 centers effectively mediate DNP for bulk 13C spins in diamond particles.
  • The study provides mechanistic insights into DNP efficiency related to electron populations and MAS frequency.
  • Findings are relevant for applications utilizing P1 diamond materials, such as diamond rotors.