SURFACE-POLARITONS AND PHONON-SPECTRUM OF SODIUM-CHLORATE CRYSTAL

Phonon spectrum of sodium chlorate (NaClO3) single crystal was studied using Raman scattering, infrared reflectivity, surface polariton (SP) dispersion and surface electromagnetic wave (SEW) measurements. Compl ex dielectric function was obtained from reflectivity spectra using Lo rentz oscillator fit and Kramers-Kronig analysis. Parameters of Lorent z oscillators are in a good agreement with Raman measurements and with SP dispersion obtained from ATR spectra. First time SEW measurements on NaClO3-air interface were made in CO2 laser tuning region to obtain complex dielectric function of NaClO3 in 10 mu m region. SEW propagat ion length approaches 50 mu m at 967 cm(-1). Experimental values of SE W effective refractive index and propagation length are in a good agre ement with the data calculated using complex dielectric function obtai ned from reflectivity.