Using the Intramolecular Contribution to the Second Moment of NMR Line Shape to Detect Site Symmetry Breakdown in Molecular Crystals

Figure 1

The angular dependence of intraionic contribution to the proton NMR spectral line second moment in ammonium chloride single crystal drawn according to (26) for a slow motion regime of cation (the numerical parameters used in (26) are = 0.254, = 0.757, 0 ≤ ϕ ≤ 2π, and 0 ≤ ≤ π).