Raman Scattering in Paratellurite, Te O 2
Raman Scattering in Paratellurite, Te O 2
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DOI：
10.1103/physrevb.5.4087
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发表时间：
1972-05
影响因子：
3.7
通讯作者：
A. Pine;G. Dresselhaus
中科院分区：
文献类型：
--
作者：
A. Pine;G. Dresselhaus
Raman spectra of the tetragonal ${{D}_{4}}^{4}$ structure of Te${\mathrm{O}}_{2}$, paratellurite, have been obtained at temperatures of 85 and 295 \ifmmode^\circ\else\textdegree\fi{}K. Frequencies and symmetry assignments for 18 of the 21 Raman-active optical branches are given with only one singlet-${A}_{1}$ and two doublet-$E$ modes not observed. The measured LO-TO splittings of the six $E$ modes observed accounts for 63% of the total oscillator strength of the known ionic contribution to the ordinary-ray dielectric constant. Estimates for the positions of the LO and TO branches of the Raman-inactive, infrared-active, ${A}_{2}$ modes are made from the anisotropic frequency shifts of the oblique phonons in the extraordinary ray. In addition some weak, anomalous, polarization-selection-rule violations are reported.
Raman spectra of the tetragonal ${{D}_{4}}^{4}$ structure of Te${\mathrm{O}}_{2}$, paratellurite, have been obtained at temperatures of 85 and 295 \ifmmode^\circ\else\textdegree\fi{}K. Frequencies and symmetry assignments for 18 of the 21 Raman-active optical branches are given with only one singlet-${A}_{1}$ and two doublet-$E$ modes not observed. The measured LO-TO splittings of the six $E$ modes observed accounts for 63% of the total oscillator strength of the known ionic contribution to the ordinary-ray dielectric constant. Estimates for the positions of the LO and TO branches of the Raman-inactive, infrared-active, ${A}_{2}$ modes are made from the anisotropic frequency shifts of the oblique phonons in the extraordinary ray. In addition some weak, anomalous, polarization-selection-rule violations are reported.