Hyperfine interaction of interstitial hydrogen atoms in alkali and silver halide crystals

The measured hyperfine (hf) shifts of interstitial hydrogen atoms in eight alkali halides scale linearly with anion orbital moments and with the lattice spacing of the host crystals. Extrapolations of the scaling relations predict corresponding hf shifts in the remaining eight alkali halides with rocksalt structure and also in AgCl and AgBr. The positive hf shifts in the fluorides are interpreted as arising from hydrogen bonding, and the negative shifts in the other alkali halides and silver halides are ascribed to van der Waals attraction from anions and ${\mathrm{Ag}}^{+}$, respectively.