Abstract
The polarized IR reflection spectra of potassium perchlorate single crystals were recorded and analysed for the frequencies of the transversal and longitudinal optical zone centre modes using classical oscillator-fit method and Kramers—Kronig analysis. For comparing the TO and LO mode frequencies obtained with the corresponding Raman data, frequencies (ω 0) unaffected by the long range electrostatic fields were calculated. These frequencies are similar to those obtained from conventional IR absorption spectra of Nujol mulls or KBr discs. From the TO/LO splittings of both the internal and external vibrations Scott and Szigeti dynamical effective ionic charges were determined and discussed in terms of ionicity and bond polarity.
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