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oai:recercat.cat:10256/126912024-06-18T12:16:38Zcom_2072_452955com_2072_2054col_2072_453069

00925njm 22002777a 4500 dc Barrabés Vera, Esther author Ollé Torner, Mercè author Borondo, Florentino author Farrelly, David author Mondelo, Josep M. author 2012-02-15 We consider the problem of the hydrogen atom interacting with a circularly polarized microwave field, modeled as a perturbed Kepler problem. A remarkable feature of this system is that the electron can follow what we term erratic orbits before ionizing. In an erratic orbit the electron makes multiple large distance excursions from the nucleus with each excursion being followed by a close approach to the nucleus, where the interaction is large. Here we are interested in the mechanisms that explain this observation. We find that the manifolds associated with certain hyperbolic periodic orbits may play an important role, despite the fact that, in some respects, the dynamics is almost Keplerian. A study of some relevant invariant objects is carried out for different system parameters. The consequences of our findings for ionization of an electron by the external field are also discussed http://hdl.handle.net/10256/12691 Sistemes hamiltonians Hamiltonian systems Sistemes dinàmics diferenciables Differentiable dynamical systems Caos (Teoria de sistemes) Chaotic behavior in system Ionització Ionization Phase space structure of the hydrogen atom in a circularly polarized microwave field