A local mode description of anharmonic vibrational excitations in linear molecules

We have recently proposed a symmetry adapted local mode model to describe v ibrational excitations in polyatomic molecules. The model was initially res tricted to the description of non-linear (and non-planar) polyatomic molecu les. In this work we extend the symmetry-adapted algebraic approach to incl ude linear molecules. In the harmonic limit the model reduces to the standa rd spectroscopic methods for molecular vibrations. Results for the triatomi c molecules HCN and CO2 are reported. (C) 1999 Elsevier Science B.V. All ri ghts reserved.