Abstract
Abstract Infrared intensities of binary overtones and combinations of CH3Cl and CD3Cl molecules have been measured by the pressure broadening technique. Simplified formulas for the intensities of binary overtone and combination bands of symmetric top molecules were given. Contribution from the mechanical anharmonicity was calculated by use of these equations. Contribution from the electric anharmonicity was estimated by ab initio MO method (4–31 G*). The calculated intensities were compared with the observed values and discussed.
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