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Integrated intensities for the Bragg reflexion of 1.070 Å neutrons by a single crystal of NH4Cl have been measured at 295 K. The experimental data were corrected for extinction. An analysis based on direct calculation of properties of nuclear smearing functions is applied to the data. The results show that the motions of chlorine and the ammonium ion as a whole can be described within experimental accuracy by the harmonic model with the values B_ = 1.90 ± 0.08 Å2 and B+ = 2.00 ± 0.08 Å2 of Debye-Waller factors for chlorine and the ammonium ion respectively. Values of parameters describing libration of the ammonium ion and the value r0 = 1.050 ± 0.005 Å for the N-H bond length were determined from the radial scattering amplitudes of the ammonium ion. The radial nuclear density shows evidence for radial vibrations of the hydrogen atoms with mean-square amplitude Δ2 = 0.006 ± 0.001 Å2.
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