Dynamic nuclear polarization by two-pulse phase modulation

Venkata SubbaRao Redrouthu – @rvsubbarao

We are here to introduce two new pulsed DNP (Dynamic Nuclear Polarization) sequences: TPPM DNP and XiX DNP. These sequences are named after analogous decoupling sequences used in Nuclear Magnetic Resonance (NMR) spectroscopy.#GlobalnmrTC2023 #HyperpolarizationNMR pic.twitter.com/yZQBijYQGI

— R. V. SubbaRao (@rvsubbarao) July 20, 2023

The coherent transfer of electron spin polarization to nuclei by means of a microwave pulse sequence is a promising new approach to enhancing the sensitivity of solid-state nuclear magnetic resonance (NMR). The development of pulse sequences for dynamic nuclear polarization (DNP) of bulk nuclei is far from complete, as is the understanding of what makes a good DNP sequence. In this context, we introduce a new sequence, termed Two-Pulse Phase Modulation (TPPM) DNP. We provide a general theoretical description for electron–proton polarization transfer by periodic DNP pulse sequences and find it in excellent agreement with numerical simulations.