2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/146878We develop a classical theory of electron confinement in conducting nanoparticles. The theory is used to compute the nonlinear optical response of the nanoparticle to a harmonic external field.Page margins have been adjusted; otherwise, identical to the previous versionOpticsClassical Physicstext