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Guinevere Mathies
March 25 @ 3:00 pm GMT+0000 – 4:00 pm GMT+0000
Pulsed dynamic nuclear polarization
All spectroscopic methods evolve from continuous-wave to pulsed. Magic-angle-spinning NMR in combination with dynamic nuclear polarization (MAS DNP) has, so far, been an exception. We try to change that by designing DNP pulse sequences.
For the time being, pulsed DNP experiments are only possible at low magnetic fields. The basic reason is that suitable microwave sources are not available above 95 GHz. Nevertheless, we learned a lot in recent years about designing DNP sequences. As a result, there now exists a family of DNP sequences, which appear, based on their matching condition, compatible with high-field MAS DNP.[1-4]
The theoretical description of a single transfer of polarization in a dipolar-coupled electron-nuclear spin system is under control. To build up DNP of bulk nuclei, however, many such transfers are needed. We recently found a numerically stable method to simulate pulsed DNP in the steady state, which even predicts the optimal repetition rate of a sequence. In my talk I will get you up to speed
.1. Tan et al. Sci. Adv. 5(1), eaav6909 (2019)
2. Redrouthu and Mathies J. Am. Chem. Soc. 144(4), 1513–1516 (2022)
3. Wili et al. Sci. Adv. 8(28), eabq0536 (2022)
4. Redrouthu, Kumar, Mathies J. Chem. Phys. 159, 014201 (2023)
8:00 AM California or 11:00 AM Boston or 4:00 PM Paris or 8:30 PM Delhi