ON THE CALCULATION OP LINE INTENSITIES IN VIBRATION-ROTATION BANDS

Author Institution: Laboratoire d'infrarouge, Laboratoire de Chime Physique de la Faculte des Sciences de ParisThe Hanson, Nielsen, Shaffer and Waggoner theory of intensities and the results obtained by Nielsen, Amat et al. in diagonalizing the vibration-rotation Hamiltonian of polyatomic molecules by contact transformations are used for giving the general form of the electric dipole moment transformed by the contract transformation, to a second order of approximation. The coefficients of the transformed electric dipole moment are given as a function of the coefficients of the contact transformation in the general case of polyatomic molecules. These results have been applied to the case of the $v_{3}$ band of the $XY_{2}$ molecule