Depolarized Brillouin spectrum of liquid CS2

Abstract

The depolarized doublet found in the Brillouin spectra of many molecular liquids has been observed in liquid CS₂. This doublet is best resolved at 162°K (near the freezing point); it broadens rapidly with increasing temperature and is unresolved at temperatures higher than 192°K. In this temperture range, the half‐widths increase from 11 to 19 GHz, yielding orientational relaxation times of 14×10⁻¹² to 8×10⁻¹² sec, respectively. The observed spectra are in good agreement with the predictions of hydrodynamic (Rytov) and microscopic (Keyes and Kivelson) theories.