Journal
SCIENCE ADVANCES
Volume 5, Issue 1, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aav6909
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Funding
- Early Postdoc Mobility grant from the Swiss National Science Foundation [165285]
- Deutsche Forschungsgemeinschaft through an Emmy Noether Grant [321027114]
- National Institutes of Biomedical Imaging and Bioengineering [EB-002804, EB-002026]
- NATIONAL INSTITUTE OF BIOMEDICAL IMAGING AND BIOENGINEERING [R01EB002804, P41EB002026] Funding Source: NIH RePORTER
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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 tau(p) spaced with delays d. A particularly robust DNP condition using a period tau(m) = tau(p) + d set to similar to 1.25 times the Larmor period tau(Larmor) is investigated which is a time-optimized pulsed DNP sequence (TOP-DNP). At 0.35 T, we obtained an enhancement of similar to 200 using TOP-DNP compared to similar to 172 with nuclear spin orientation via electron spin locking (NOVEL), a commonly used pulsed DNP sequence, while using only similar to 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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