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- W1979488100 abstract "Room-temperature reflectivity measurements in the wavelength range 1 to 140 ensuremath{mu} have been made on corundum and ruby. Classical oscillator analysis of the data shows that the optical lattice modes with dipole moment vibrating perpendicular to the $C$ axis occur at 15.7, 17.6, 22.6, 26.0 ensuremath{mu}. Those vibrating parallel to the $C$ axis occur at 17.1 and 25.0 ensuremath{mu}. The line-widths and strengths are reported. Many forbidden modes are observed. Two of these can have a strength which is comparable to the allowed modes but which is sensitive to surface treatment. Symmetry arguments show that these strong forbidden modes are the ${mathrm{A}}_{1u}$ (forbidden) phonon branches picking up dipole moment as a result of shear strain." @default.
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- W1979488100 date "1963-11-15" @default.
- W1979488100 modified "2023-10-17" @default.
- W1979488100 title "Infrared Lattice Vibrations and Dielectric Dispersion in Corundum" @default.
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- W1979488100 doi "https://doi.org/10.1103/physrev.132.1474" @default.
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