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Deuteron magnetic resonance in Na 2 S 2 O 6  · 2 D 2 O single crystals was investigated in the temperature range —68°C to +80°C. The activation energy for the flipping motion of the heavy water molecule was found to be (9.2 ± 1.5) kcal/mole. The quadrupole coupling constant and the asymmetry parameter in the low temperature case was found to be e 2  q Q/h= (244 ± 3) kHz, η = 0.103 ± 0.003 for gne deuteron and e   q Q/h = (236 ± 3) kHz, η=0.116 ± 0.003 for the other deuteron of the same water molecule. For the fast flipping case at room temperature e 2  q Q/h= (131 ± 2) kHz and η=0.77 ± 0.02. Good agreements in structural parameters of the water molecule of Na 2 S 2 O 6  · 2 D 2 O and of Na 2 S 2 O 6  · 2 H 2 O were found.

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Dynamics of Water in Crystal Hydrates: III. Deuteron Magnetic Resonance and the Motion of Heavy Water Molecules in Na 2 S 2 O 6  · 2 D 2 O Single Crystals