Abstract
We show that strong classical electric fields with certain kinds of space-time variation can create ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ pairs which are strongly resonant in energy and momentum. These resonance effects are peculiar to spin (1/2, and are allowed because of the unconventional structure of a ``unitarity'' relation governing the pair-production process. This relation is a physical expression of the Klein paradox. The general principles are illustrated with exact solutions of idealized examples.
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