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Updated: Jun 8, 2025

Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
Published on: December 30, 2016
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.
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.
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.
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