Absolute infrared intensities of methyl bromide and all deuterium derivatives

The integrated infrared intensities of all the fundamentals of CH3Br, CH2DBr, CHD2Br, and CD3Br are experimentally determined using nitrogen broadening pressures of 37 atm. The results are interpreted in terms of dipole moment derivatives with respect to the symmetry coordinates (∂μ/∂S) and in terms of bond charge parameters. These molecular polar quantities derived from the observed intensities are compared with the corresponding values from molecular orbital calculations.