For authors
Submission status

Archive (English)
   Volumes 41-62
   Volumes 1-20
   Volumes 21-40
      Volume 40
      Volume 39
      Volume 38
      Volume 37
      Volume 36
      Volume 35
      Volume 34
      Volume 33
      Volume 32
      Volume 31
      Volume 30
      Volume 29
      Volume 28
      Volume 27
      Volume 26
      Volume 25
      Volume 24
      Volume 23
      Volume 22
      Volume 21
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.