Infrared lattice vibrations of zinc selenide and zinc telluride

H. D. Riccius

The infrared reflection and transmission spectra of zinc selenide and zinc telluride were investigated at room temperature in the region of the transverse and longitudinal optical phonon frequencies. From the transmission measurements at oblique incidence of vacuum-evaporated films of these materials, the fundamental longitudinal optical (LO) vibration frequency could be obtained directly. Using the Lyddane-Sachs-Teller relation, the static dielectric constant was found to be 9.2 for ZnSe and 10.3 for ZnTe. © 1968 The American Institute of Physics.

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Materials
Curve 1
Temperature, K: ~298 Wavelength Range, µm: 40.0-54.1 Geometry θ θ' ω': <30° <30° Composition (weight percent), Specifications, and Remarks: ZnSe (1.7 µm thick); quartz substrate; substrate crystalline and cut parallel to the z axis; high purity grade ZnSe vapor deposited on substrate at 548 K.
Curve 1
Temperature, K: ~298 Wavelength Range, µm: 42.8-51.6 Geometry θ' θ ω': ~0° ~0° Composition (weight percent), Specifications, and Remarks: ZnSe (1.7 µm thick); quartz substrate; substrate crystalline and cut parallel to the z axis; high purity grade ZnSe vapor deposited on substrate at 548 K.
Curve 2
Temperature, K: 295 Wavelength Range, µm: 39.0-50.4 Geometry θ' θ ω': 45° 45° Composition (weight percent), Specifications, and Remarks: Similar to above specimen and conditions.
Curve 1
Temperature, K: ~298 Wavelength Range, µm: 52.69-58.87 Geometry θ θ' ω': ~0° ~0° Composition (weight percent), Specifications, and Remarks: ZnTe (1.5 µm thick) on quartz substrate; substrate crystalline and cut parallel to z axis; high purity grade ZnTe evaporated on substrate at 348 K.
Curve 2
Temperature, K: ~298 Wavelength Range, µm: 50.99-58.87 Geometry θ θ' ω': ~0° ~0° Composition (weight percent), Specifications, and Remarks: Similar to the above specimen and conditions except 3.0 µm thick.
Curve 3
Temperature, K: ~298 Wavelength Range, µm: 48.70-58.87 Geometry θ θ' ω': ~0° ~0° Composition (weight percent), Specifications, and Remarks: Similar to the above specimen and conditions except 9.2 µm thick.
Curve 4
Temperature, K: 295 Wavelength Range, µm: 46.7-59.1 Geometry θ θ' ω': 45° 45° Composition (weight percent), Specifications, and Remarks: Similar to curve 1 specimen and conditions.