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VOLUME 37 (1983) | ISSUE 5 | PAGE 212
Excitation of lines in the infrared spectrum of Hg2CI2 crystals due to cell doubling with a phase transition
Excitation of new lines in the infrared spectra of crystals due to doubling of the unit cell accompanying a structural phase transition (for improper ferroelastics Hg2Cl2) is observed for the first time. The number and polarization of lines excited for T< Tc coincide with the predictions of a group-theoretical analysis. The dispersion of optical branches is determined experimentally from the critical orientation Γ-^Χ of the Brillouin zone of the paraelectric phase.