Time-optimized pulsed dynamic nuclear polarization

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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. 5(1), eaav6909. eISSN 2375-2548. Available under: doi: 10.1126/sciadv.aav6909

@article{Tan2019-01-18Timeo-44745, title={Time-optimized pulsed dynamic nuclear polarization}, year={2019}, doi={10.1126/sciadv.aav6909}, 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.}, note={Article Number: eaav6909} }

Tan, Kong Ooi Weber, Ralph T. Griffin, Robert G. 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. 2019-01-18 2019-01-28T11:53:46Z Yang, Chen Griffin, Robert G. Tan, Kong Ooi Time-optimized pulsed dynamic nuclear polarization Yang, Chen terms-of-use Mathies, Guinevere eng Mathies, Guinevere Weber, Ralph T. 2019-01-28T11:53:46Z

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