Abstract
Atoms and molecules in highly excited (Rydberg) states have a number of unique characteristics due to the strong dependence of their properties on the values of principal quantum numbers. The paper discusses the results of an investigation of collisional Rydberg complexes specific features, resulting in the development of dynamic chaos and the accompanying diffusion autoionization processes. It is shown (experiment and theory) that, in subthermal low energies, the global chaotic regime that evolved in quasimolecular systems leads to significant changes in the Rydberg gases radiation/ionization kinetics. The effect of Förster resonance on the width of the fluorescence spectra and stochastic ionization processes in Rydberg systems is also discussed.
Highlights
The interest in the research of physical processes involving highly excited (Rydberg) atomic systems is caused by their significance in the fundamental issues of science [1,2] and the prospects of their wide implementations in modern applied knowledge-intensive technologies
Our work presents the results of studies of the radiative and collisional work presents thewith results of studies and theory) of the radiativeofand collisional kineticsOur of Rydberg atoms, their specific(experiment features arising from the closeness highly excited kinetics of to Rydberg atoms, with theirThe specific features arising the closeness ofreveal highlysignificant excited bound states the energy continuum
The anomalously long lifetimes of the pof the sodium atom are explained by the proximity of the Na p- and s-series energy levels structure series Rydberg states of the sodium atom are explained by the proximity of the Na p- and s-series energy levels structure to the Förster resonance configuration
Summary
The interest in the research of physical processes involving highly excited (Rydberg) atomic systems is caused by their significance in the fundamental issues of science (due to the combination of quantum and classical properties) [1,2] and the prospects of their wide implementations in modern applied knowledge-intensive technologies (see, e.g., [3]). Due to strong Stark/Zeeman effects, interaction with electromagnetic fields can lead to multiple quasi-crossings and the mixing of Rydberg electron sublevels with different orbital (l), azimuthal (m), and principal (n) quantum numbers This allows for the selectively excited initial state to begin a chaotic motion across a dense grid of Rydberg levels with the subsequent transition to the energy continuum. The purpose of our work is to describe an alternative, semiclassical approach that is based on the concept of dynamic chaos evolution in Hamiltonian systems [26,27,28] Another set of questions under consideration concerns the features of the radiation kinetics of Rydberg atoms in the vicinity of the Förster resonance. The peculiarities of the radiative rate constants, as discussed below, are of potential interest for the interpretation of spectroscopic data, as obtained from fluorescence spectra of cold media of astrophysical relevance, such as different modifications of cold white dwarfs [30] or neutral sodium clouds near Jovian moon Io
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