Effects of a soft-core coulomb potential on the dynamics of a hydrogen atom near a metal surface

•Effects of a soft-core potential approximation in the dynamics of a Coulomb atomic system.•System: Rydberg hydrogen atom near a metallic surface subjected to an electric field.•Differences in the nature of rectilinear motions have a crucial effect in the dynamics.•Bifurcations of periodic orbits ar...

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Bibliographic Details
Published in:Communications in nonlinear science & numerical simulation 2019-03, Vol.68, p.94-105
Main Authors: Iñarrea, Manuel, Lanchares, Víctor, Palacián, Jesús F., Pascual, Ana I., Salas, J. Pablo, Yanguas, Patricia
Format: Article
Language:English
Subjects:
Atoms & subatomic particles
Coulomb potential
Coulomb-like potential
Electric fields
Electrons
Hydrogen
Ionization dynamics
Metal surfaces
Metallurgy
Periodic orbits
Regularization
Soft-core potential approximation
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Summary:•Effects of a soft-core potential approximation in the dynamics of a Coulomb atomic system.•System: Rydberg hydrogen atom near a metallic surface subjected to an electric field.•Differences in the nature of rectilinear motions have a crucial effect in the dynamics.•Bifurcations of periodic orbits are different in the real system and in the softened one.•The ionization basins are better identified in the real potential. The goal of this paper is to investigate the effects that the replacement of the Coulomb potential by a soft-core Coulomb potential produces in the classical dynamics of a perturbed Rydberg hydrogen atom. As example, we consider a Rydberg hydrogen atom near a metal surface subjected to a constant electric field in the electron-extraction regime. Thence, the dynamics of the real perturbed Coulomb system, studied by applying the Levi–Civita regularization, is compared with that of the softened one. The results of this study show that the global behavior of the system is significantly altered when the original Coulomb potential part is replaced by a soft-core potential.
ISSN:1007-5704
1878-7274
DOI:10.1016/j.cnsns.2018.07.039