A superbroadening (⩾ 700 cm -1) stimulated scattering added to the pump line has been studeid in a CS 2 liquid-core hollow fiber system with a long gain-length (2.5 m). A photon-scattering model of optical Kerr (induced reorientation) effect and quantum description of Rayleigh-Kerr scattering process are suggested. The salient features of our experimental results can be explained by the suggested theoretical approach.