Sodium nuclear quadrupole interactions in sodium hydroxide. I. The orthorhombic phase

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Abstract
Using nuclear magnetic resonance techniques the sodium nuclear quadrupole couplings have been observed in anhydrous NaOH and in the monohydrate. They have the values, respectively, of e2qzzQ/h=3.54±0.08 MHz, η=0 and e2qzzQ/h=2.11±0.04 MHz, η=0.62±0.03 at 293 K. The fact that η=0 for the anhydrous salt agrees with a lattice gradient calculation although it differs from previous Zeeman quadrupole resonance experiments.