Abstract
Raman scattering from liquid carbon disulfide has been studied for different concentrations in benzene. Modes ν1 (656cm−1) and 2ν2 (796cm−1) are allowed bands of carbon disulfide, while ν2 (396cm−1) is forbidden by the selection rules. However, a weak band has been observed along with the strong allowed totally symmetrical stretching mode ν1. The observation is ascribed to the effects of the vibrational anharmonicity of free molecule and intermolecular interaction potential. The ν1 and 2ν2 Fermi resonance can be influenced by the external conditions. The effects of the ν1 and 2ν2 Fermi resonance on the Raman frequency and relative intensity are discussed and the Raman scattering cross section of ν2 is studied for different concentration of carbon disulfide in benzene. The second-order perturbation quantum theory is introduced to explain the results that the Raman scattering of ν2 is influenced by 2ν2 and its Fermi resonance with ν1.
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