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'The infrared spectrum of three diethyl benzenes has been observed in the region from two to forty microns. Different infrared spectrographs were used and absorption curves are given for the different regions. A Tentaive semi-emprirical, assigment of the observed frequences to the molecular vibrations is given."

" The behavior of the low frequency dieletric constant of NaNO2 as function of frenquency and temperature is consistently correlated to the temperature behavior of the frequencies and linewidths of the phonons of B1 summetry in the crytal. The frequency of the librational 'soft' mode closely related to the ferroelectric - paraelectric phase transition does not go to zero but tends to a hard core value at the transition temperature and frequency is explained by assumig a dielectric relaxation mechanism proposed by Mason and not by Cochran´s soft phonon model".

" A report of current investigacions in light scattering spectrocopy at the U. S. C. Solid Optics Laboratory is presented".