Dynamical potential approach to DCO highly excited vibration

The conserved polyad number of DCO vibration is employed to classify its highly excited vibrational states. The dynamical potentials are shown to be anti-Morse and harmonic along the D–C and C–O coordinates, respectively. These, together with the Lyapunov and phase space analyses, are demonstrated to interpret the state stability that in the lower energy realm according to a polyad, D–C is prone to be dissociative or chaotic while the states in the very high energy realm, are stable and regular. A model of a particle moving in an anti-Morse potential and coupled to a simple harmonic oscillator is established for DCO vibrational dynamics.