Amplification of Dynamic Nuclear Polarization at 200 GHz by Arbitrary Pulse Shaping of the Electron Spin Saturation Profile

The Journal of Physical Chemistry Letters
Ilia Kaminker, Songi Han

Abstract

Dynamic nuclear polarization (DNP) takes center stage in nuclear magnetic resonance (NMR) as a tool to amplify its signal by orders of magnitude through the transfer of polarization from electron to nuclear spins. In contrast to modern NMR and electron paramagnetic resonance (EPR) that extensively rely on pulses for spin manipulation in the time domain, the current mainstream DNP technology exclusively relies on monochromatic continuous wave (CW) irradiation. This study introduces arbitrary phase shaped pulses that constitute a train of coherent chirp pulses in the time domain at 200 GHz (7 T) to dramatically enhance the saturation bandwidth and DNP performance compared to CW DNP, yielding up to 500-fold in NMR signal enhancements. The observed improvement is attributed to the recruitment of additional electron spins contributing to DNP via the cross-effect mechanism, as experimentally confirmed by two-frequency pump-probe electron-electron double resonance (ELDOR).

References

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Oct 21, 2015·Solid State Nuclear Magnetic Resonance·Daniel E M HoffAlexander B Barnes
Feb 28, 2016·Journal of Magnetic Resonance·Jan Henrik Ardenkjaer-Larsen
Apr 6, 2016·Physical Chemistry Chemical Physics : PCCP·I KaminkerS Vega
Jan 18, 2017·Physical Chemistry Chemical Physics : PCCP·Alisa LeavesleySongi Han
Apr 24, 2017·The Journal of Chemical Physics·T V CanR G Griffin
May 10, 2017·Journal of Magnetic Resonance·Ilia KaminkerSongi Han
May 13, 2017·Angewandte Chemie·Thach V CanRobert G Griffin
Nov 4, 2017·The Journal of Chemical Physics·Sheetal K JainRobert G Griffin
Nov 22, 2017·Progress in Nuclear Magnetic Resonance Spectroscopy·Aany Sofia Lilly ThankamonyBjörn Corzilius

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Citations

Oct 31, 2018·Physical Chemistry Chemical Physics : PCCP·Alisa LeavesleySongi Han
May 28, 2019·Solid State Nuclear Magnetic Resonance·Daphna ShimonChandrasekhar Ramanathan
Dec 4, 2019·The Journal of Physical Chemistry Letters·Asif EqubalSongi Han
Jan 16, 2019·The Journal of Physical Chemistry Letters·Asif EqubalSongi Han

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