Effect of bending vibration on rotation and centrifugal distortion parameters of XY2 molecules. Application to the water molecule

The calculation of the anomalous behaviour of rotation and centrifugal distortion parameters of H 2 O molecule with a Lorentz+quadratic zero-order potential is presented. Particular cases of general giving the dependence of these parameters with respect to the quantum number ν 2 associated with the bending vibration are discussed Calcul du comportement anomal des parametres de rotation et de distorsion centrifuge de la molecule H 2 O a partir du potentiel de Lorentz+quadratique d'ordre zero. Des cas particuliers des formules generales de dependance de ces parametres en fonction du nombre quantique ν 2 associe a la vibration de deformation angulaire sont discutes