Saddle points of the potential energy surface for HCCF determined by an algebraic approach

The potential energy surface of the tetratomic molecule HCCF is determined by the U(4) algebraic method. The combination coefficients in the Hamiltonian are gotten from fitting the spectroscopic data. The molecular properties, such as, force constants and dissociation energies, are obtained in terms of the potential energy surface. A saddle point is also derived.