Observation of Electron Spin Dynamics on Hundreds-of-Microseconds Timescales in High-Field Magic Angle Spinning EPR.
- 1School of Chemistry, Tel-Aviv University, Tel-Aviv6997801, Israel.
- 2National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida32310, United States.
- 3Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida32306, United States.
Abstract
Dynamic nuclear polarization (DNP) efficiency critically depends on electron-nuclear polarization transfer, necessitating a thorough understanding of electron spin dynamics under DNP-relevant conditions, namely, high magnetic fields and magic angle spinning (MAS). While high-field electron paramagnetic resonance (EPR) under MAS is the only tool capable of probing these dynamics, its application has been limited by technological constraints and methodological gaps, leaving the microscopic behavior of electron spin packets under MAS largely unexplored experimentally. Here we demonstrate the first rotor-synchronized three-pulse stimulated echo MAS-EPR experiments at 6.9 T with spinning frequencies up to 37 kHz. This approach enables the characterization of electron spin dynamics on timescales of hundreds of microseconds under MAS, revealing its strong dependence on both EPR line anisotropy and MAS rate. We further validated our experimental findings with time-domain numerical simulations. This work establishes a robust methodology for investigating electron spin dynamics in MAS-DNP on the experimentally relevant timescales.
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BibTeX
@article{khamrui2026observation,
title = {{Observation of Electron Spin Dynamics on Hundreds-of-Microseconds Timescales in High-Field Magic Angle Spinning EPR.}},
author = {Sudipta Khamrui and Orit Nir-Arad and Frederic Mentink-Vigier and Alexander B Fialkov and Nurit Manukovsky and Ilia Kaminker},
journal = {The journal of physical chemistry letters},
year = {2026},
month = oct,
doi = {10.1021/acs.jpclett.6c02108},
url = {https://europepmc.org/article/MED/42917154},
note = {CC BY},
}
RIS
TY - JOUR
TI - Observation of Electron Spin Dynamics on Hundreds-of-Microseconds Timescales in High-Field Magic Angle Spinning EPR.
AU - Sudipta Khamrui
AU - Orit Nir-Arad
AU - Frederic Mentink-Vigier
AU - Alexander B Fialkov
AU - Nurit Manukovsky
AU - Ilia Kaminker
PY - 2026
DA - 2026/10/01
JO - The journal of physical chemistry letters
DO - 10.1021/acs.jpclett.6c02108
UR - https://europepmc.org/article/MED/42917154
AB - Dynamic nuclear polarization (DNP) efficiency critically depends on electron-nuclear polarization transfer, necessitating a thorough understanding of electron spin dynamics under DNP-relevant conditions, namely, high magnetic fields and magic angle spinning (MAS). While high-field electron paramagnetic resonance (EPR) under MAS is the only tool capable of probing these dynamics, its application has been limited by technological constraints and methodological gaps, leaving the microscopic behavior of electron spin packets under MAS largely unexplored experimentally. Here we demonstrate the first rotor-synchronized three-pulse stimulated echo MAS-EPR experiments at 6.9 T with spinning frequencies up to 37 kHz. This approach enables the characterization of electron spin dynamics on timescales of hundreds of microseconds under MAS, revealing its strong dependence on both EPR line anisotropy and MAS rate. We further validated our experimental findings with time-domain numerical simulations. This work establishes a robust methodology for investigating electron spin dynamics in MAS-DNP on the experimentally relevant timescales.
SN - 1948-7185
ER -