2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/90025The interaction of a moving charged particle with its coherent electromagnetic field is analysed in the framework of non-relativistic quantum mechanics. It is shown that, when this interaction is taken into account, a spatially localized state may have a mean energy lower than the one corresponding to a delocalized state.6 pages; Sec.2 and Sec.7 substantially rewrittenQuantum Physicstext