Symmetry-based pulsed DNP and EPR sequences
Abstract
Pulsed microwave irradiation provides more versatile control over spin dynamics than continuous-wave (CW) methods. This study adapts symmetry-based dipolar recoupling sequences, which are originally designed for magic angle spinning (MAS) NMR, to exploit electron-nuclear interactions for dynamic nuclear polarization (DNP) and pulsed electron paramagnetic resonance (EPR). Using the trityl radical OX071 at X-band (0.35 tesla), phase-modulated microwave pulses were synchronized with the nuclear Larmor period. Experimental results show effective DNP performance and electron-nuclear distance measurements in EPR, consistent with numerical simulations and theory. This work shows that many MAS NMR pulse sequences can be adapted to static pulsed EPR and DNP with minor modifications. This cross-disciplinary approach provides a versatile platform for designing optimized, application-specific magnetic resonance methodologies across various field strengths, subject to instrumental capabilities.
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BibTeX
@article{pang2026symmetrybased,
title = {{Symmetry-based pulsed DNP and EPR sequences}},
author = {Zhenfeng Pang and Giuseppe Sicoli and Benoit Driesschaert and Jean-Paul Amoureux and Hervé Vezin and Kong Ooi Tan},
journal = {Science Advances},
year = {2026},
month = sep,
doi = {10.1126/sciadv.aef4949},
url = {https://hal.science/hal-05756985v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Symmetry-based pulsed DNP and EPR sequences
AU - Zhenfeng Pang
AU - Giuseppe Sicoli
AU - Benoit Driesschaert
AU - Jean-Paul Amoureux
AU - Hervé Vezin
AU - Kong Ooi Tan
PY - 2026
DA - 2026/09/21
JO - Science Advances
DO - 10.1126/sciadv.aef4949
UR - https://hal.science/hal-05756985v1
AB - Pulsed microwave irradiation provides more versatile control over spin dynamics than continuous-wave (CW) methods. This study adapts symmetry-based dipolar recoupling sequences, which are originally designed for magic angle spinning (MAS) NMR, to exploit electron-nuclear interactions for dynamic nuclear polarization (DNP) and pulsed electron paramagnetic resonance (EPR). Using the trityl radical OX071 at X-band (0.35 tesla), phase-modulated microwave pulses were synchronized with the nuclear Larmor period. Experimental results show effective DNP performance and electron-nuclear distance measurements in EPR, consistent with numerical simulations and theory. This work shows that many MAS NMR pulse sequences can be adapted to static pulsed EPR and DNP with minor modifications. This cross-disciplinary approach provides a versatile platform for designing optimized, application-specific magnetic resonance methodologies across various field strengths, subject to instrumental capabilities.
SN - 2375-2548
ER -