A Spectroscopic Description of Asymmetric Isotopologues of CO.

A polyad-conserving algebraic model applied to vibrational excitations of asymmetric isotopologues of CO is presented. First, the problem of vibrational excitations is studied by taking into account only the minimum subspace of states to characterize the Fermi interaction. This analysis allows an estimation of the force constants as well as the feasibility of describing the system in a local mode scheme, in terms of (2) operators associated with Morse ladder operators for the stretches.