Sub-THz technology for dynamic nuclear polarization in nuclear magnetic resonance (DNP NMR): transverse confinement of microwave propagation through heterogeneous solid DNP samples

摘要

Passive microwave components for DNP NMR, theresulting spatial microwave field distribution at the sam-ple site, the sample structure, the molecular structure, andDNP spin physics are closely linked to each other. Westudy specific examples of low-temperature (100 K) DNPsamples, characterized by a high degree of spatial hetero-geneity on a sub-mm scale. We report on our work inprogress investi-gating the local microwave propagationmodified through transverse confinement in DNP sam-ples with possible consequences for the DNP spin trans-fer mechanism.