The "magic angle" is a term used primarily in the context of nuclear magnetic resonance (NMR) spectroscopy and solid-state NMR. It refers to a specific angle, approximately 54.74 degrees (or arccos(1/√3)), at which the anisotropic interactions in a solid sample can be effectively averaged out. This is particularly relevant for studying solid materials where the molecular orientations can lead to broadening of NMR signals.
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