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

Figure 2

Angular dependence of the 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: ϕ = π/4 and −π/8 ≤ ≤ 9π/8. The experimental values = 29.9 Gs² (ϕ = π/4, = 0) and = 52 Gs² (ϕ = π/4, = π/2) [11] used by calculating the dynamic weights = 0.254 and = 0.757 are fitted by open circles in the graph.