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Hyper-Rayleigh scattering in solution is used for the determination of the hyperpolarizability of nonlinear optical molecules. Obtaining the first hyperpolarizability without having to independently determine the dipole moment and the second hyperpolarizability is an advantage over the electric-field-induced second-harmonic generation technique. Values of the first hyperpolarizability of 2310^-30 esu for para-nitroaniline, 10510^-30 esu for 4-methoxy-4'-nitrostilbene, and 9510^-30 esu for 4-hydroxy-4'-nitrostilbene dissolved in chloroform have been obtained. The equivalent-internal-field model is shown to hold for small saturated molecules.
Clays et al. (Mon,) studied this question.