Direct comparison of the temperature dependence of the response functions measured by light scattering and optical Kerr effect spectroscopy

The frequency response functions of liquid carbon disulfide have been measured under various temperatures by two independent experiments of light scattering and ultrafast optical Kerr effect spectroscopy. The temperature dependence has been compared quantitatively after correcting the appropriate temperature-dependent factors. It is found that the response functions obtained by these methods agree quite well with each other, which enables us to estimate accurately the temperature variations at various frequencies. The frequency-dependent variation rate thus obtained is discussed in relation to the anharmonicity of the phonon modes.