2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/217256The time-dependent Dirac equation is solved using the three-dimensional Finite Difference-Time Domain (FDTD) method. The dynamics of the electron wave packet in a scalar potential is studied in the arrangements associated with the Klein paradox: potential step barriers and linear potentials. No Klein paradox is observed.Quantum Physicstext