Chen J, Wong K Y
Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, China.
J Chem Phys. 2005 May 1;122(17):174505. doi: 10.1063/1.1884085.
We employed depolarized hyper-Rayleigh scattering (HRS) to investigate the intermolecular interactions in liquid nitrobenzene. By comparing the depolarization ratios of the second-harmonic scattered light from neat nitrobenzene and mixtures of nitrobenzene and methanol of varying mixing ratios, we demonstrated the existence of a coherent component of HRS in liquid nitrobenzene. The coherent component was found to essentially disappear at a sufficiently high dilution of the nitrobenzene liquid. We also observed that both localized orientational correlation and delocalized libron excitation contribute to coherent HRS in liquid nitrobenzene. The delocalized contribution to coherent HRS was found to diminish much more readily with the introduction of interstitial foreign molecules than the localized contribution.
我们采用去偏振超瑞利散射（HRS）来研究液态硝基苯中的分子间相互作用。通过比较纯硝基苯以及不同混合比例的硝基苯与甲醇混合物的二次谐波散射光的去偏振比率，我们证明了液态硝基苯中存在HRS的相干成分。发现该相干成分在硝基苯液体充分稀释时基本消失。我们还观察到，局域取向相关性和离域振动子激发都对液态硝基苯中的相干HRS有贡献。发现与局域贡献相比，随着间隙外来分子的引入，离域对相干HRS的贡献更容易减弱。
