Light beating spectroscopy of polarized and depolarized scattering in p-n-hexyl p'-cyanobiphenyl.

Both polarized and depolarized light scatterings were observed in the isotropic phase of p-n-hexyl p'-cyanobiphenyl (6CB) with a new technique of optical beating spectroscopy, in which a Fabry-Perot etalon was replaced with a spectrum analyzer. This technique is very useful for Rayleigh and Brillouin scattering over the range, at present, from 10 4 to 10 9 Hz with a resolution as high as 1 kHz if needed. The result in 6CB was correlated with the equation derived from the theories by de Gennes and also by Alms et al. The observed spectra were in a remarkable agreement with the theoretical prediction, giving strong support to the theories