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- W4320882933 abstract "Cross polarization (CP) transfers via Hartmann-Hahn matching conditions are one of the cornerstones of solid-state magic-angle spinning NMR experiments. Here we investigate a windowed sequence for cross polarization (wCP) at 55 kHz magic-angle spinning, placing one window (and one pulse) per rotor period on one or both rf channels. The wCP sequence is known to have additional matching conditions. We observe a striking similarity between wCP and CP transfer conditions when considering the flip angle of the pulse rather than the rf-field strength applied during the pulse. Using fictitious spin-1/2 formalism and average Hamiltonian theory, we derive an analytical approximation that matches these observed transfer conditions. We recorded data at spectrometers with different external magnetic fields up to 1200 MHz, for strong and weak heteronuclear dipolar couplings. These transfers, and even the selectivity of CP were again found to relate to flip angle (average nutation)." @default.
- W4320882933 created "2023-02-16" @default.
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- W4320882933 date "2023-04-01" @default.
- W4320882933 modified "2023-10-16" @default.
- W4320882933 title "Windowed cross polarization at 55 kHz magic-angle spinning" @default.
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- W4320882933 doi "https://doi.org/10.1016/j.jmr.2023.107404" @default.
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