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MEASURING UNIAXIAL SPECTRAL DIELECTRIC RESPONSE: APPLICATIONS TO CALCITE $CaCO_{3}$ AND TYSONITE $LaF_{3}$.

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/15860

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Title: MEASURING UNIAXIAL SPECTRAL DIELECTRIC RESPONSE: APPLICATIONS TO CALCITE $CaCO_{3}$ AND TYSONITE $LaF_{3}$.
Creators: Parrish, J. F.; Perry, C. H.
Issue Date: 1969
Abstract: Often it is not possible or convenient to orient a crystal's optic axis precisely parallel or perpendicular to a large single crystal face. Furthermore, it can be shown both theoretically and experimentally that even rather small misalignments of an optic axis (less than five are degrees) can lead to large, easily measurable but possibly spurious effects. Nevertheless, quantitative and qualitative analysis of the measured spectra is possible, as it can be proved that the zeros (longitudinal optical frequencies) of the effective spectral dielectric response must occur at the zeros of the characteristic spectral dielectric response functions defined parallel and perpendicular to the optic axis, independent of the angle between the optic axis and crystal face. Moreover, the characteristic dielectric response functions can be calculated analytically from the experimentally measured effective spectral dielectric response functions of the ordinary and extraordinary rays reflected or transmitted by a single crystal face. The polarized far infrared transmittance and reflectance of calcite, which has strong anisotropics at high lattice frequencies ($\sim 1500 cm^{-1}$), and of tysonite, which has strong anisotropics at low lattice frequencies ($\sim 100cm^{-1}$), illustrate some of the effects predicted theoretically.
URI: http://hdl.handle.net/1811/15860
Other Identifiers: 1969-T-4
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