Direct-interaction electrodynamics of a two-electron atom

Details Direct-interaction electrodynamics of a two-electron atom Direct-interaction electrodynamics of a two-electron atom

2000-03-12

arxiv.org/abs/nlin/0003031v1

Nonlinear Sciences

Chaotic Dynamics

contains six figures

Scientific paper

We study numerically the dynamical system of a two-electron atom with the Darwin interaction as a model to investigate scale-dependent effects of the relativistic action-at-a-distance electrodynamics. This dynamical system consists of a small perturbation of the Coulomb dynamics for energies in the atomic range. The key properties of the Coulomb dynamics are: (i) a peculiar mixed-type phase space with sparse families of stable non-ionizing orbits and (ii) scale-invariance symmetry, with all orbits defined by an arbitrary scale parameter. The combination of this peculiar chaotic dynamics ((i) and (ii)), with the scale-dependent relativistic corrections (Darwin interaction) generates the phenomenon of scale-dependent stability: We find numerical evidence that stable non-ionizing orbits can exist only for a discrete set of resonant energies. The Fourier transform of these non-ionizing orbits is a set of sharp frequencies. The energies and sharp frequencies of the non-ionizing orbits we study are in the quantum atomic range.

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