RAMAN SPECTRUM OF $NaClO_{3}$ AT VERY HIGH PRESSURES.

Abstract

Raman spectra of single crystals of $NaClO_{3}$ have been studied at atmospheric pressure and elevated pressures as high as 35 kbar. The frequencies of all of the vibrational modes increase with increasing pressure. Between 1 atm. and 30 kbar, $\nu_{1}$ (A) increases by $12 cm^{-1}$; both the A and F components of $\nu_{2}$ increase by $8 cm^{-1}$; and the E and F components of $\nu_{4}$ increase by $9 cm^{-1}$. For the same charge of pressure, the $957-cm^{-1}$ (E) component of $\nu_{2}$ shifts $+ 16 cm^{-1}$; the $967-cm^{-1}$ (F) component shifts $+ 18 cm^{-1}$, the $989-cm^{-1}$ (F, transverse) component shifts $+ 17 cm^{-1}$, and the $1029-cm^{-1}$ (F, longitudinal) component shifts $+20 cm^{-1}$. Effects of pressure on the frequencies of the external lattice modes also will be discussed.