Publikation: Time-optimized pulsed dynamic nuclear polarization
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Science Advances. 2019, 5(1), eaav6909. eISSN 2375-2548. Available under: doi: 10.1126/sciadv.aav6909
Zusammenfassung
Pulsed dynamic nuclear polarization (DNP) techniques can accomplish electron-nuclear polarization transfer efficiently with an enhancement factor that is independent of the Zeeman field. However, they often require large Rabi frequencies and, therefore, high-power microwave irradiation. Here, we propose a new low-power DNP sequence for static samples that is composed of a train of microwave pulses of length τp spaced with delays d. A particularly robust DNP condition using a period τm = τp + d set to ~1.25 times the Larmor period τLarmor is investigated which is a time-optimized pulsed DNP sequence (TOP-DNP). At 0.35 T, we obtained an enhancement of ~200 using TOP-DNP compared to ~172 with nuclear spin orientation via electron spin locking (NOVEL), a commonly used pulsed DNP sequence, while using only ~7% microwave power required for NOVEL. Experimental data and simulations at higher fields suggest a field-independent enhancement factor, as predicted by the effective Hamiltonian.
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TAN, Kong Ooi, Chen YANG, Ralph T. WEBER, Guinevere MATHIES, Robert G. GRIFFIN, 2019. Time-optimized pulsed dynamic nuclear polarization. In: Science Advances. 2019, 5(1), eaav6909. eISSN 2375-2548. Available under: doi: 10.1126/sciadv.aav6909BibTex
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year={2019},
doi={10.1126/sciadv.aav6909},
title={Time-optimized pulsed dynamic nuclear polarization},
number={1},
volume={5},
journal={Science Advances},
author={Tan, Kong Ooi and Yang, Chen and Weber, Ralph T. and Mathies, Guinevere and Griffin, Robert G.},
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<dcterms:abstract xml:lang="eng">Pulsed dynamic nuclear polarization (DNP) techniques can accomplish electron-nuclear polarization transfer efficiently with an enhancement factor that is independent of the Zeeman field. However, they often require large Rabi frequencies and, therefore, high-power microwave irradiation. Here, we propose a new low-power DNP sequence for static samples that is composed of a train of microwave pulses of length τp spaced with delays d. A particularly robust DNP condition using a period τ<sub>m</sub> = τ<sub>p</sub> + d set to ~1.25 times the Larmor period τ<sub>Larmor</sub> is investigated which is a time-optimized pulsed DNP sequence (TOP-DNP). At 0.35 T, we obtained an enhancement of ~200 using TOP-DNP compared to ~172 with nuclear spin orientation via electron spin locking (NOVEL), a commonly used pulsed DNP sequence, while using only ~7% microwave power required for NOVEL. Experimental data and simulations at higher fields suggest a field-independent enhancement factor, as predicted by the effective Hamiltonian.</dcterms:abstract>
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