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Theoretical Treatment of Pulsed DNP Experiments: Effects of Spectral Exchange

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Abstract

In the present work, we provide a theoretical treatment of pulsed Overhauser-type dynamic nuclear polarization (DNP) in the presence of spectral exchange, namely, Heisenberg exchange. The expression for the DNP enhancement of a nuclear magnetic resonance (NMR) signal is generalized by redefining the “deviation factor”, expressing the deviation of the electron spin polarization from its equilibrium value, averaged over the period of the pulse sequence. We can demonstrate that spectral exchange significantly increases the deviation factor and, thus, the NMR enhancement. The present treatment allows one to determine the optimal pumping frequency at different exchange rates.

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Acknowledgements

This work has been supported by the Russian Foundation for Basic Research (Grant no. 18-33-00251) and Ministry of Science and Higher Education of the Russian Federation (project AAAA-A16-116121510087-5).

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Authors and Affiliations

  1. International Tomography Center, Siberian Branch of the Russian Academy of Science, Novosibirsk, 630090, Russia

    Egor A. Nasibulov, Konstantin L. Ivanov & Renad Z. Sagdeev

  2. Novosibirsk State University, Novosibirsk, 630090, Russia

    Egor A. Nasibulov, Konstantin L. Ivanov & Renad Z. Sagdeev

  3. A.P. Ershov Institute of Informatics Systems, Siberian Branch of the Russian Academy of Science, Novosibirsk, 630090, Russia

    Egor A. Nasibulov

  4. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Science, Moscow, 119991, Russia

    Renad Z. Sagdeev

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  1. Egor A. Nasibulov
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  2. Konstantin L. Ivanov
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  3. Renad Z. Sagdeev
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Correspondence to Egor A. Nasibulov.

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Nasibulov, E.A., Ivanov, K.L. & Sagdeev, R.Z. Theoretical Treatment of Pulsed DNP Experiments: Effects of Spectral Exchange. Appl Magn Reson 50, 1233–1240 (2019). https://doi.org/10.1007/s00723-019-01144-6

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  • DOI: https://doi.org/10.1007/s00723-019-01144-6

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