Perturbative analysis of the influence of pi sup +pi sup - strong interaction on the relation between A sub 2 subpi creation probabilities in ns-states

It is shown that the relations between probabilities of A sub 2 subpi-atoms creation in ns-states, derived with neglecting of the strong interaction between pions, hold practically unchanged if the strong interaction is taken into account in the first order of the perturbation theory. The formulation of Deser equation for the energy levels shift of the hadronic atoms (HA) is given in terms of the effective range of the strong interaction and relative correction to the Coulomb wave function of HA at origin, caused by the strong interaction.