| Autor: |
Stadnyk, V. I., Rudish, M. Ya., Shchepansky, P. A., Matviishyn, I. M., Gaba, V. M., Gorina, O. M. |
| Předmět: |
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| Zdroj: |
Optics & Spectroscopy; Feb2018, Vol. 124 Issue 2, p216-220, 5p |
| Abstrakt: |
The infrared reflection spectra of mechanically free and uniaxially compressed LiNH4SO4 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 ε1 and imaginary ε2 parts of the dielectric constant and to calculate the frequencies of longitudinal ωLO and transverse ωТO vibrations, decay constant γ, and oscillator strength f of mechanically free and compressed LiNH4SO4 crystals. The considerable changes observed in the main reflection bands are explained by the effect of uniaxial pressures on the NH4 and SO4 tetrahedra. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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