STUDIES OF DEPOLARIZED HYPER-RAYLEIGH SCATTERING OF AN ORGANIC-MOLECULE

We study the depolarized hyper-Rayleigh scattering of p-nitroaniline ( PNA) using an improved technique. The result indicates that the hyperp olarizability tensor of PNA has essentially the characteristics of a r od-like structure, with a single nonvanishing diagonal component beta( 333), where the 3-axis corresponds to the polar direction. This is in contrast with previous theoretical calculations, which predicted non-n egligible values for some of the off-diagonal components. A plausible explanation of the experimental result is suggested based on a model o f the local field correction factors. ?The result shows that depolariz ed hyper-Rayleigh scattering may not be very useful in determining the relationship between hyperpolarizability tensor components as previou sly suggested.