A holder allowing rotation of a flat coil relative to the static magnetic field of a nuclear magnetic resonance (NMR) spectrometer over the range of orientations from parallel to perpendicular has been built and incorporated into a two-channel wide line static solid-state NMR probe. Radiofrequency induction by the coil is perpendicular to for all rotational angles. Such a coil holder provides ready access to an additional directional variable for experiments exploiting sample orientation such as those using planar-supported oriented phospholipid bilayers. Rotation of the flat coil is demonstrated using NMR of oriented phospholipid and peptide bilayers sandwiched between pairs of mica substrates.
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