Iñarrea, ManuelLanchares, VíctorPalacián Subiela, Jesús FranciscoPascual, Ana IsabelSalas, José PabloYanguas Sayas, Patricia2018-10-022021-03-0120191007-5704 (Print)1878-7274 (Electronic)10.1016/j.cnsns.2018.07.039https://academica-e.unavarra.es/handle/2454/30887The 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.application/pdfeng© 2018 Elsevier B.V. The manuscript version is made available under the CC BY-NC-ND 4.0 license.Coulomb-like potentialSoft-core potential approximationPeriodic orbitsIonization dynamicsinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess