Rotational States of NH_4^+ in KBr Crystal.A Complementary Study by Inelastic Neutron Scattering and Calorimetric Measurements

概要

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Rotational tunneling energy states of the NHj Ton doped in KBr crystal have beenreinvestigated so as to obtain decisive evidence on which symmetry is the most likelyone for the orientation of the Tons in the lattice. The inelastic neutron scattering experiments at 1.8 K uncovered the existence of two characteristic bands in the energyrange &< 8 men, which leads to the conclusion that the model of energy states for C.,symmetry is exclusively acceptable for this system. The 0-dependence of the scatter-ing features was also shown to be reasonably consistent with the model. Moreover,both the "equilibrium" and "instantaneous" heat capacities obtained between 4 and10 K yielded the confirmation of the C., symmetry. The rate of conversion betweenthe nuclear spin symmetry species of NHj was examined.[rotational tunneling, ammonium ion in alkali lattices, neutron scattering, ]l calorimetry, spin conversionl
社団法人日本物理学会の論文
1990-02-15