Abstract
A comprehensive study of vibrational spectra of a KTP single crystal is presented using both Raman scattering and Infrared (IR) reflectance. The 196 mode frequencies are listed according to a revised group theoretical analysis, which addresses the different atomic clusters comprising the crystal unit cell and their symmetry. Inverse LO-TO splitting is suggested to interpret the ν3 vibrational spectra of the PO43- clusters of the A1 symmetry. Theoretical account invokes a proximity between strong and weak polar vibrations and Lyddane-Sachs-Teller's model of LO-TO splitting in a dielectric medium [1]. Many other mode frequencies appear too close to allow unequivocal interpretation of their LO-TO splitting sign.
Original language | English |
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Article number | 103385 |
Journal | Vibrational Spectroscopy |
Volume | 121 |
DOIs | |
State | Published - 1 Jul 2022 |
Keywords
- IR reflectance
- KTiOPO
- LO-TO splitting
- Raman scattering
- Theoretical mode calculation
ASJC Scopus subject areas
- Spectroscopy