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Issue 38, 2019
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A DNP-hyperpolarized solid-state water NMR MASER: observation and qualitative analysis

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Abstract

We present observations of an NMR MASER (microwave amplification by stimulated emission of radiation) of hyperpolarized 1H nuclei by dynamic nuclear polarization (DNP) at 1.2 K and in a magnetic field of 6.7 T. The sustained maser pulses originate from the interplay between radiation damping (RD) due to the large 1H magnetization, and the remagnetization to a negative value by the DNP process. NMR signals lasting for several tens of seconds are thus observed on an ensemble of dipolar-coupled nuclear spins. Magnetization dynamics are analyzed in terms of the combined Bloch–Maxwell and Provotorov (BMP) equations for RD and DNP. Insight into the long time evolution of the magnetization is provided by a theoretical analysis of this nonlinear dynamical system, and by fitting the NMR signal to a simplified version of the BMP equations.

Graphical abstract: A DNP-hyperpolarized solid-state water NMR MASER: observation and qualitative analysis

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Publication details

The article was received on 12 Jun 2019, accepted on 08 Sep 2019 and first published on 11 Sep 2019


Article type: Paper
DOI: 10.1039/C9CP03334C
Phys. Chem. Chem. Phys., 2019,21, 21278-21286

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    A DNP-hyperpolarized solid-state water NMR MASER: observation and qualitative analysis

    E. M. M. Weber, D. Kurzbach and D. Abergel, Phys. Chem. Chem. Phys., 2019, 21, 21278
    DOI: 10.1039/C9CP03334C

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