Abstract
The theory of direct and associative ionization of Rydberg atoms in thermal collisions with neutral atomic particles has been developed. Some effective mechanisms of ionization due to the scattering of the perturbing atom on the core of the Rydberg atom have been investigated. These mechanisms of ionization correspond to the non-adiabatic energy exchange between the highly excited electron and inner electrons or nuclei of a quasimolecule. General equations obtained within the framework of perturbation theory and the quasiclassical approximation have been used to determine the rate constants of ionization for the various types of colliding atoms. In particular, the ionization processes of Rydberg rare-gas X(nl) atoms by ground-state atoms of the buffer Y(1S0) or the parent X(1S0) rare gas have been investigated in detail. The results of numerical calculations are presented for the Rydberg hydrogen and xenon atoms in collisions with He, Kr and Xe atoms.
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