The Effect of Uniaxial Pressures on the Infrared Spectra of LiNH4SO4 Crystals

The infrared reflection spectra of mechanically free and uniaxially compressed LiNH 4 SO 4 crystals are studied for the first time in the spectral range of 800–1700 сm –1 along three crystallophysical directions. The Kramers–Kronig dispersion relations are used to determine the dispersion and baric...

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Veröffentlicht in:Optics and spectroscopy 2018-02, Vol.124 (2), p.216-220
Hauptverfasser: Stadnyk, V. I., Rudish, M. Ya, Shchepansky, P. A., Matviishyn, I. M., Gaba, V. M., Gorina, O. M.
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Sprache:eng
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Zusammenfassung:The infrared reflection spectra of mechanically free and uniaxially compressed LiNH 4 SO 4 crystals are studied for the first time in the spectral range of 800–1700 сm –1 along three crystallophysical directions. The Kramers–Kronig dispersion relations are used to determine the dispersion and baric dependences of refractive index n and the real ε 1 and imaginary ε 2 parts of the dielectric constant and to calculate the frequencies of longitudinal ω LO and transverse ω ТO vibrations, decay constant γ, and oscillator strength f of mechanically free and compressed LiNH 4 SO 4 crystals. The considerable changes observed in the main reflection bands are explained by the effect of uniaxial pressures on the NH 4 and SO 4 tetrahedra.
ISSN:0030-400X
1562-6911
DOI:10.1134/S0030400X18020169