Labidi, N. S2023-05-302023-05-302021-09-01N. S. Labidi,SOLVENT EFFECT ON HYPER RAYLEIGH SCATTERING (HRS) FIRST HYPERPOLARIZABILITY OF SUBSTITUTED POLYENE : PART ( .Journal of Fundamental and Applied Sciences.VOL13 N03.01/09/2021.university of el oued [visited in ../../….]. available from [copy the link here]1112-9867http://dspace.univ-eloued.dz/handle/123456789/25048articleThe first hyperpolarizabilities β HRS of substituted hexatriene molecules have been carried out to assess the effects of the bridge length, of the frequency dispersion as well as the solvent polarity . These calculations confirm the particular behaviour of the first hyperpolarizability β HRS , depolarization ratio and the anisotropy factor as a function of the incident light frequency and solvent polarity. The impact of the solvent and expanding the π conjugated limit to improve the β HRS Finally, t he interplay between  HRS and  ////,  vec , d N..N... E gap and the Kirkwood Onsager factor [(ε 1)/(2ε + 1)] was established.enKeywords: First hyperpolarizability ; Hyper Rayleigh scattering (HRS); push pull; solventArticle