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VOLUME 34 (1981) | ISSUE 4 | PAGE 183
Interaction of pseudospins and the density spectrum of libration states in an NH4Cl
The bandwidth (T6) of one-phonon libration states has been determined from the Raman scattering (RS) spectra of two-phonon transitions. The static octupole moment of an ammonium ion has been calculated for the first time in the multipole-multipole interaction model of T6; this has made it possible to estimate the interaction energy of pseudospins and the phase-transition temperature.