Abstract
Discusses the definition of frequency-dependent electric and magnetic multipole moments. It is shown from classical electrodynamics that there are two types of magnetic multipole moments ME(lm omega ) and MM(lm omega ), defined as moments of the magnetisation with an electric or magnetic spherical vector wave as weight function. The moment ME(lm omega ) contributes to the emission of electric multipole radiation. The authors define quantum-mechanical multipole operators in correspondence with the classical case and discuss Siegert's theorem (1937).
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