Relativistic charged particles in the fi
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W. Becker
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Article
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1977
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Elsevier Science
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English
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Solutions of the Klein-Gordon and Dirac equation for a charged particle in the field of an electromagnetic plane wave in a medium with a constant refractive index n are discussed. Generally, for n2< 1, spontaneous pair creation from the vacuum, and for n2> 1, energy bands are observed. The interplay