Various facets of intermolecular transfer of phase coherence by nuclear dipolar fields
Abstract. Several pulse sequences that allow for an intermolecular transfer of phase coherence from abundant solvent to sparse solute spins are presented. The transfer is mediated by dipolar fields stemming from the solvent nuclei and occurs during suitable uninterrupted radio-frequency pulse-trains. Theoretical expressions for the evolution of the solvent magnetization under continuous irradiation are derived. A pulse sequence for the retrieval of high-resolution spectra in inhomogeneous magnetic fields is described, and another sequence to detect a double quantum transfer. In addition, various schemes where the magnetization is modulated with multiple pulsed field gradients along different directions are discussed. In these schemes, the dipolar field can be decomposed into two components, each at the helm of its own transfer.
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