1980•Journal of Physics A Mathematical and GeneralOpen access

Frequency-dependent electric and magnetic multipole moments and Siegert's theorem

T. F. Meister, B. U. Felderhof

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 M E (lm omega ) and M M (lm omega ), defined as moments of the magnetisation with an electric or magnetic spherical vector wave as weight function. The moment M E (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).

Open-access reader

About this research paper

What this paper is about

Why it matters

OpenAlex reports 3 citations for this work. Citation counts describe recorded attention and do not establish research quality.

Key contribution

A contribution statement is not available in the OpenAlex record.

Method / approach

Method details are not available in the OpenAlex metadata.

Main findings

Findings are not separately available in the OpenAlex metadata.

Limitations

Limitations are not available in the OpenAlex metadata.

Applications

Application details are not available in the OpenAlex metadata.

Available abstract

Key concepts: Multipole expansion, Spherical multipole moments, Physics, Omega, Magnetic moment, Magnetization, Neutron magnetic moment, Quantum electrodynamics