The statistical integrals of bound and quasi-bound states of gas phase complexes formed by symmetrical nonpoint monomers

Equations for calculations of the statistical integrals of bound and quasi-bound weak binary complex states in the gas phase are extended to nonpoint monomers. The equations for states of both types are derived using a unified approach different from those reported earlier. The equations can be used for estimating the thermodynamic functions, equilibrium constants, and concentrations of weakly bound complexes in the ideal gas state and for verifying the results of numerical simulation of association processes in the gas phase.