On the basis of the new mathematical approach, mathematical formulas have been obtained to calculate statistical integrals of the bound and quasi-bound states of weak binary complexes in the gas phase. As contrasted to those methods published earlier, the new approach 1) allows deriving the formulas for both the bound and quasi-bound states on the unified basis and 2) allows a simple generalization to the case of non-point monomer masses. The formulas obtained can be used to estimate thermodynamic functions, equilibrium constants, and concentrations of the weakly bound complexes in an ideal gas state.
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