Knowledge Bank

Raman spectra of single crystals of $NaClO3$ 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 $12cm-1$; both the A and F components of $\nu 2$ increase by $8cm-1$; and the E and F components of $\nu 4$ increase by $9cm-1$. For the same charge of pressure, the $957-cm-1$ (E) component of $\nu 2$ shifts $+16cm-1$; the $967-cm-1$ (F) component shifts $+18cm-1$, the $989-cm-1$ (F, transverse) component shifts $+17cm-1$, and the $1029-cm-1$ (F, longitudinal) component shifts $+20cm-1$. Effects of pressure on the frequencies of the external lattice modes also will be discussed.