Collisions between systems of Coulomb particles. I. Small-angle scattering for time-dependent fields

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Abstract
Collisions between stationary systems of charged particles, i.e., systems in a dynamic equilibrium, are investigated in a so‐called small‐angle approximation. The interaction of unperturbed systems, described in terms of time‐varying electric multipoles (with the dependance on time given by Fourier analysis) is discussed in detail. It is found that the exponential cutoff for the interaction is a characteristic feature of systems with fields periodically varying in time. Relations important for development of the low energy atomic collision theory are derived.