The absolute intensities of the binary combination bands in the infrared spectrum of SF 6

Abstract

The intensities of all the fundamentals and binary combination bands in the infrared spectrum of SF 6 have been measured. Estimates of the cubic normal-coordinate force constants previously determined from an anharmonic Urey—Bradley force field have been used to compute the contributions to the combination intensities from the first derivatives of the dipole moment. These, in turn, have been used to obtain experimental values of the second derivatives of the molecular electric dipole moment with respect to the normal coordinates.