Librons Observed in Liquid Acetonitrile by Hyper-Rayleigh Scattering

Abstract

Hyper-Rayleigh scattering intensity ratios $I_{\mathrm{VV}}{/I}_{\mathrm{VH}}$ in the range 9–26 are observed for liquid acetonitrile $\left(\mathrm{CH}{}_3\mathrm{CN}\right)$, inconsistent with localized modes of motion in an isotropic fluid. The observations are consistent with propagating orientational modes (librons) with frequency $\nu =2\mathrm{cm}{}^{-1\mathrm{}}$, which scatter 71% of the light.