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Updated: Jan 19, 2026

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
Published on: February 23, 2016
A DNP-hyperpolarized solid-state water NMR MASER: observation and qualitative analysis
Emmanuelle M M Weber1, Dennis Kurzbach, Daniel Abergel
1Laboratoire des Biomolécules, LBM, Département de Chimie, Ecole Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France. daniel.abergel@ens.fr.
This study demonstrates a novel NMR MASER using hyperpolarized 1H nuclei and dynamic nuclear polarization (DNP). The technique generates sustained maser pulses, enabling NMR signals lasting tens of seconds.
Area of Science:
- Nuclear Magnetic Resonance (NMR) Spectroscopy
- Quantum Optics
- Condensed Matter Physics
Background:
- Dynamic Nuclear Polarization (DNP) enhances NMR signal sensitivity.
- Microwave Amplification by Stimulated Emission of Radiation (MASER) principles can be applied to nuclear spins.
- Radiation damping (RD) effects are significant in high-polarization NMR experiments.
Purpose of the Study:
- To observe and analyze an NMR MASER phenomenon in hyperpolarized 1H nuclei.
- To investigate the interplay between radiation damping and DNP in generating sustained NMR signals.
- To model the magnetization dynamics using the Bloch-Maxwell and Provotorov (BMP) equations.
Main Methods:
- Utilizing dynamic nuclear polarization (DNP) to hyperpolarize 1H nuclei.
- Performing NMR MASER experiments at cryogenic temperatures (1.2 K) and high magnetic fields (6.7 T).
- Analyzing magnetization dynamics via combined Bloch-Maxwell and Provotorov (BMP) equations.
Main Results:
- Sustained NMR MASER pulses were observed, lasting for several tens of seconds.
- The phenomenon arises from the interplay between radiation damping and DNP-induced remagnetization to negative values.
- NMR signals were detected on an ensemble of dipolar-coupled nuclear spins.
Conclusions:
- The study successfully demonstrated an NMR MASER using DNP-hyperpolarized 1H nuclei.
- The observed long-lasting NMR signals are explained by the nonlinear dynamics described by the BMP equations.
- Theoretical analysis and simplified BMP equation fitting provide insight into the system's long-time evolution.
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