Time-optimized pulsed dynamic nuclear polarization
Name
eaav6909.full.pdf
Description
Published version
Size
597.22 KB
Format
Adobe PDF
Checksum (MD5)
6b613e3a46ec814470c286a7a9962d6b
Author(s)
Tan, Kong Ooi
Yang, Chen
Mathies, Guinevere
Griffin, Robert Guy
Date Issued
January 2019
Journal
Science Advances
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Tan, Kong Ooi et al. “Time-optimized pulsed dynamic nuclear polarization.” Science Advances, vol. 5, 2019, eaav6909 © 2019 The Author(s)
Version
Final published version
Abstract
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 t p spaced with delays d. A particularly robust DNP condition using a period t m = t p + d set to ~1.25 times the Larmor period t Larmor 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.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Terms of Use
Creative Commons Attribution NonCommercial License 4.0
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1126/SCIADV.AAV6909
