Observation of dynamic nuclear polarization echoes

It is demonstrated that the time evolution of the electron-nuclear polarization transfer process during pulsed dynamic nuclear polarization (DNP) can be reversed on a microsecond timescale, leading to the observation of DNP echoes. The DNP echoes are induced by consecutive application of two pulse t...

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Bibliographic Details
Published in:Science advances 2024-10, Vol.10 (42), p.eadr2420
Main Authors: Wili, Nino, Nielsen, Anders B, Carvalho, José P, Nielsen, Niels Chr
Format: Article
Language:English
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Summary:It is demonstrated that the time evolution of the electron-nuclear polarization transfer process during pulsed dynamic nuclear polarization (DNP) can be reversed on a microsecond timescale, leading to the observation of DNP echoes. The DNP echoes are induced by consecutive application of two pulse trains that produce effective Hamiltonians that differ only in the sign of the effective hyperfine coupling. The experiments have been performed on a frozen solution of trityl radicals in water/glycerol on a homebuilt X-band electron paramagnetic resonance/DNP spectrometer at 80 kelvins. We envisage that DNP echoes will play an important role in future development of pulsed DNP for sensitivity-enhanced nuclear magnetic resonance, hyperfine spectroscopy, and quantum sensing.
ISSN:2375-2548
2375-2548
DOI:10.1126/sciadv.adr2420