Isotropic and anisotropic Rayfeish spectra of fluid N2S are reported. Collision-induced rotational smttering contributions are considered to explain the spectral features. It is argued that isotropic spectra arc mainly due to the dipole-quadrupole polarizability at h&h frequency while the first hyperpolarizabiliry is significant at low frequency_ 1. Introduction Light scattering is a powerful tool to probe the microscopic molecular dynamics in liquids. In monoatomic fluids it gives information about the collisioninduced (Cl) pair anisotropy. In molecular systems consisting of isotropically polar&able particles, lowfrequency dipole-induced-dipole (DID) and highfrequency collision-induced rotational scattering (CIRS) contributions are observed [I-3]_ For fluids of anisotropic molecules, Cl effects are entangied with rotational dynamics [4,5]. DID effects account satisfactorily for the few measured isotropic spectra [.5,6] which are purely CI in nature. Recently, fluid H,S has been investigated by several authors [7-lo]. The interest in this fluid is due to the fact that H2S has been suggested as a model for H,O without H bor?ds. In ref. [7] this point has been clarified and a criterion for considering H,S as a suitable model for I-I,0 has been given on the basis of self-diffusion coefficient measurements. Light scattering experiments on liquid Hz!5 show very broad wings and a decreasing depolarization ratio at increasing frequency, Perrot and Bouachir [S] found no differences between anisotropic D2S and H,S spectra and they attributed 99% of the intensity to DID contributions, while the behaviour of the depolarization ratio suggested to Mauacurati et al. * Work supported by GNSM (CNR) and MPL [ 101 that phenomena different from pure rotation and Cl rare-gas-like behaviour have to be present in