TY - JOUR
T1 - High-field pulsed EPR spectroscopy under magic angle spinning
AU - Nir-Arad, Orit
AU - Fialkov, Alexander B.
AU - Shlomi, David H.
AU - Manukovsky, Nurit
AU - Mentink-Vigier, Frederic
AU - Kaminker, Ilia
N1 - Publisher Copyright:
Copyright © 2024 The Authors, some rights reserved.
PY - 2024/8/30
Y1 - 2024/8/30
N2 - In this work, we demonstrate the first pulsed electron paramagnetic resonance (EPR) experiments performed under magic angle spinning (MAS) at high magnetic field. Unlike nuclear magnetic resonance (NMR) and dynamic nuclear polarization (DNP), commonly performed at high magnetic fields and under MAS to maximize sensitivity and resolution, EPR is usually measured at low magnetic fields and, with the exception of the Spiess group work in the late 1990s, never under MAS, due to great instrumentational challenges. This hampers the investigation of DNP mechanisms, in which electron spin dynamics play a central role, because no experimental data about the latter under DNP-characteristic conditions are available. We hereby present our dedicated, homebuilt MAS-EPR probehead and show the pulsed MAS-EPR spectra of P1 center diamond defect recorded at 7 tesla. Our results reveal unique effects of MAS on EPR line shape, intensity, and signal dephasing. Time-domain simulations reproduce the observed changes in the line shapes and the trends in the signal intensity.
AB - In this work, we demonstrate the first pulsed electron paramagnetic resonance (EPR) experiments performed under magic angle spinning (MAS) at high magnetic field. Unlike nuclear magnetic resonance (NMR) and dynamic nuclear polarization (DNP), commonly performed at high magnetic fields and under MAS to maximize sensitivity and resolution, EPR is usually measured at low magnetic fields and, with the exception of the Spiess group work in the late 1990s, never under MAS, due to great instrumentational challenges. This hampers the investigation of DNP mechanisms, in which electron spin dynamics play a central role, because no experimental data about the latter under DNP-characteristic conditions are available. We hereby present our dedicated, homebuilt MAS-EPR probehead and show the pulsed MAS-EPR spectra of P1 center diamond defect recorded at 7 tesla. Our results reveal unique effects of MAS on EPR line shape, intensity, and signal dephasing. Time-domain simulations reproduce the observed changes in the line shapes and the trends in the signal intensity.
UR - http://www.scopus.com/inward/record.url?scp=85203074119&partnerID=8YFLogxK
U2 - 10.1126/sciadv.adq6073
DO - 10.1126/sciadv.adq6073
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C2 - 39213356
AN - SCOPUS:85203074119
SN - 2375-2548
VL - 10
JO - Science advances
JF - Science advances
IS - 35
M1 - eadq6073
ER -