Flores-Hidalgo, G.Malbouisson, APC2014-05-202014-05-202005-03-28Physics Letters A. Amsterdam: Elsevier B.V., v. 337, n. 1-2, p. 37-45, 2005.0375-9601http://hdl.handle.net/11449/23950We consider a system consisting of an atom in the dipole approximation, coupled to the electromagnetic field. Using recently introduced renormalized coordinates and dressed states, we give a non-perturbative solution to the atom radiation process. From this formalism a non-exponential decay law naturally emerges. However, at least for low frequencies and weak coupling, there is only a very small, practically non-detectable, deviation from a purely exponential decay, in agreement with all previous results in the literature. (c) 2005 Elsevier B.V. All rights reserved.37-45engArtigo10.1016/j.physleta.2005.01.066WOS:000227654000006Acesso restrito