Proton NMR line shapes inZrHx

The second moments ($M_{2D}$) were obtained from magic-echo measurements of the proton line shapes for high-purity polycrystalline $\mathrm{Zr}{\mathrm{H}}_x$. Contrary to previous reports of anomalously large $M_{2D}$ values in $\mathrm{Zr}{\mathrm{H}}_x$, the present results are in excellent agreement with the calculated dipolar moments which assume random occupancy of protons on only tetrahedral interstitial sites.