Hyper-quasielastic light scattering of liquid CCl4 due to the rotational motions of molecules and the intermolecular interactions

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Abstract
Hyper‐quasielastic light scattering of liquid carbon tetrachloride CCl4 is measured in the temperature range between −9 and 68 °C. The spectra consist of two different Lorentzians, narrow and broad ones. By the measurements of the polarization ratio and the temperature dependence of the spectra, the narrow Lorentzian spectrum is found to arise from the rotational Brownian motion of a CCl4 molecule. This spectrum is inactive for both Raman and infrared measurements but is only active for the hyper‐Raman measurement. The broad Lorentzian spectrum mainly comes from the temporary dipole moment induced by the intermolecular interactions between the molecules. The intermolecular interaction becomes strongest around 40 °C. The temperature dependences of the half‐width and the integrated intensity of the narrow Lorentzian are strongly affected by the intermolecular interactions.