# THE INFRARED OPTICAL PROPERTIES OF LiF AS A FUNCTION OF TEMPERATURE AND PRESSURE

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 Title: THE INFRARED OPTICAL PROPERTIES OF LiF AS A FUNCTION OF TEMPERATURE AND PRESSURE Creators: Soriaga, M. P.; Lewis, G. J.; Kachare, A.; Andermann, G. Issue Date: 1975 Publisher: Ohio State University Abstract: Reliable infrared reflectance data of LiF have been obtained at various temperatures and processed by an Improved Kramers-Kronig dispersion analysis technique. A careful analysis of the imaginary dielectric index ($\epsilon$) spectra has provided important insights into the question of electrical and mechanical anharmonicity in the lattice modes of LiF. To further investigate this problem, work has been done on the IR transmission spectra of LiF thin films at high pressures. The optical indices as a function of pressure have been obtained through a Kramers-Kronig transmission dispersion analysis of the transmission values. Results will be presented and evaluated in terms of various models of anharmonicity. The proper methodology to obtain reliable high pressure IR transmission data of LiF thin films will also be outlined. Description: This work was supported by the National Science Foundation. Present address of G. J. Lewis: Department of Physics, King's College, London, England. Present address of A. Kachare: Department of Physics, University of Southern California, Los Angeles, California."" Author Institution: Department of Chemistry, University of Hawaii URI: http://hdl.handle.net/1811/9420 Other Identifiers: 1975-Sigma-23