The Infrared Dispersion of Carbon Dioxide

The term in the dispersion equation of carbon dioxide corresponding to the bending vibration ($\lambda =14.91\mathrm{}$μ) has been calculated from the assumption that this dispersion is due to interaction of the electric vector of the light wave and permanent dipole moments associated with the carbon-oxygen valence bonds. The calculation indicates a magnitude of 1.17×${10}^{-18\mathrm{}}$ e.s.u. for these dipoles, which is shown to be in agreement with the value to be expected from the measured moment of acetone.