An extended proton magnetic resonance study of lithium sulfate monohydrate is presented. An oddity in the resulting Pake curves appears. Some of the curves show a shift so that they are described by equations of the form, ΔH = 2α[3cos2(ϕ+ϕ0)cos2δ−1] +constant shift.
There are two orientations of the hydrated water molecule. For these the direction angles of the proton‐proton axes with respect to the crystallographic a, b, and c axes are, respectively, α0=97°, β0=45°, γ0=48°, and α0=74°, β0=38°, γ0=127°. Apparently the hydrogens bond O5— —H☒O5☒H— —O1, where O5 are neighboring water oxygens and O1 is a sulfate oxygen.
Several possible origins of the shifts in the Pake curves are discussed with limited success. An adequate theoretical explanation is lacking.