Abstract
Considers aspects of the non-relativistic quantum theory of radiation that occur when the coordinates and momenta of all material particles (nuclei as well as electrons) are treated as dynamical variables. The formalism gives the complete scheme of atomic field equations for an ensemble of ions, free electrons, atoms or molecules and comprises the multipolar Hamiltonian for systems composed solely of electrically neutral atoms or molecules. It also deals with effects due specifically to motion of the nuclei, such as the Doppler effect or the recoil that occurs when photons are emitted, scattered or absorbed.

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