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In our previous research, it has been demonstrated that such inelasticprocesses in atom Rydberg-atom collisions, as chemi-ionization and (n-n')mixing, should be considered together. Here we will review the present state ofthe art and the actual problems will be discussed. In this context, we willconsider the influence of the (n-n')-mixing during a symmetric atomRydberg-atom collision processes on the intensity of chemi-ionization process.It will be taken into account H(1s) + H*(n) collisional systems, where theprincipal quantum number n $>>$ 1. It will be demonstrated that the inclusionof (n-n') mixing in the calculation, influences significantly on the values ofchemi-ionization rate coefficients, particularly in the lower part of the blockof the Rydberg states. Different possible channels of the (n-n')-mixinginfluence on chemi-ionization rate coefficients will be demonstrated. Thepossibility of interpretation of the (n-n')-mixing influence will be consideredon the basis of two existing methods for describing of the inelastic processesin symmetrical atom Rydberg-atom collisions.

Non-Elastic Processes in Atom Rydberg-Atom Collisions: Review of State of Art and Problems