Abstract
The 17O-proton nuclear double-resonance spectra of KH3(SeO3)2 have been measured above and below the ferroelastic transition and the quadrupole coupling has been determined for all three chemically nonequivalent oxygen sites in the unit cell. The 17O-proton magnetic dipolar coupling as well as the 17O quadrupole coupling data clearly show the presence of proton motion between two equilibrium sites in the O(2)–H- - -O(2) bond which freezes out below Tc. The temperature dependence of 30K quadrupole frequency has been as well determined.
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