Location of the H atoms in ammonium persulphate by deuteron NMR. Verification by X-ray diffraction

The equilibrium positions of the H atoms in (NH₄)₂S₂O₈ are determined using deuteron NMR spectroscopy, mainly at T = 17 K. The results are verified by X-ray diffraction and constitute the background for a discussion of the complex tunnelling and stochastic jump dynamics of the ammoniuum ions.