Abstract
Adopting Akhiezer and Berestetski's definition of the scattering matrix, the elastic scattering of an electromagnetic wave packet by a spherically symmetric center is studied. Van Kampen's macroscopic causality condition is easily adapted to the present formalism. The case of a wave with nonvanishing angular momentum z component is discussed. It is also shown that one must associate waves with opposite angular momentum components to construct a sharp-front wave packet. A resonance expansion of the scattering matrix is given, with an appropriate threshold factor.
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