Improved analytical model for Rayleigh-Brillouin scattering spectrum in gases

An improved analytical model (G-factor model) for the Rayleigh-Brillouin scattering (RBS) spectrum of gases is proposed and discussed based on RBS spectra of nitrogen. Three analytical models (G3, V3, and G-factor models) were compared with the spontaneous RBS experimental data and coherent RBS simulation data based on Pan's S7 model. The results show that the proposed model has a larger scope of application as compared to the G3 model, and offers less multivalued solutions compared to the V3 model. In addition, this analytical model provides a better representation of the profiles than the Tenti S6 model. This novel analytical model has fewer parameters and more stable fitting results. It maintains a high fitting accuracy and has a larger scope of application compared to the other analytical models.