Phonon zinc compounds

Table ft.1-139 Phonon frequencies/wavenumbers at symmetry points for zinc compounds. Zinc oxide (ZnO), fundamental optical modes, T = 300 K, from Raman spectroscopy zinc sulfide (ZnS), T = 300 K zinc selenide (ZnSe), from Raman spectroscopy and luminescence zinc telluride (ZnTe), RT, from neutron scattering... 

In this chapter some of the presently known optical properties of zinc oxide are reviewed. In particular, the anisotropic dielectric functions (DFs) of ZnO and related compounds from the far-infrared (FIR) to the vacuum-ultraviolet (VUV) spectral range are studied. Thereupon, many fundamental physical parameters can be derived, such as the optical phonon-mode frequencies and their broadening values, the free-charge-carrier parameters, the static and high-frequency dielectric constants, the dispersion of the indices of refraction within the band-gap region, the fundamental and above-band-gap band-to-band transition energies and their excitonic contributions. 

Like other zinc-blende type compounds GeSi is an infrared active material. The optical phonon at the F-point is associated with an electric dipole moment which is related to the transverse effective charge e. In terms of ap and its volume derivative (see eq. (49) of Ref. [8]), is given by... 

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