Abstract
Collisional quenching of Rydberg states of Na(nl) atoms during the interaction with Sr (5s2) and Ca (4s2) atoms is theoretically studied. The effects of two quenching mechanisms are considered: the resonant one associated with transitions between ionic and covalent terms of a quasi-molecule formed during collisions and the non-resonant mechanism caused by quasi-free electron scattering by a perturbing atom. The ranges of the prevalence of these mechanisms are determined depending on the principal and orbital quantum numbers, as well as the electron affinities of the alkaline-earth atom.
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