  We show that the energy spectrum of the one-dimensional Dirac equation in the
presence of a spatial confining point interaction exhibits a resonant behavior
when one includes a weak electric field. After solving the Dirac equation in
terms of parabolic cylinder functions and showing explicitly how the resonant
behavior depends on the sign and strength of the electric field, we derive an
approximate expression for the value of the resonance energy in terms of the
electric field and delta interaction strength.
