Насонов (Белгородский университет) ATOMIC BREMSSTRAHLUNG: RETROSPECTIVES, CURRENT STATUS AND PERSPECTIVES M. Ya. <...> Amusia The Racah Institute of Physics, The Hebrew University, Jerusalem, Israel Ioffe Physical-Technical Institute, St. Petersburg, Russia We describe here the «Atomic bremsstrahlung» (AB) emission of continuous spectrum electromagnetic radiation, which is generated in collisions of particles that have internal deformable structure that includes positively and negatively charged constituents. <...> The deformation of one or both colliding partners induces multiple, mainly dipole, timedependent electrical moments that become a source of radiation. <...> As examples, fast electron atom, non-relativistic and relativistic collisions are considered. <...> Attention is given to ion atom and atom atom collisions. <...> Specifics of elastic and inelastic (i.e. radiation accompanied by destruction of collision partners) AB will be mentioned. <...> INTRODUCTION According to Electrodynamics, both classical and quantum, continuous spectrum electromagnetic radiation is generated when a particle with charge p e and mass p m moves in a static external field (Akhiezer and Beres© Amusia M. Ya., 2005. tetsky, 1965; Heitler, 1954). <...> A tiny atom or a molecule, a solid body or a macroscopic magnet, a star or a galaxy can form this static field. <...> In all these cases the radiation created is called Bremsstrahlung (BrS). <...> It is emitted by a charged projectile particle that looses its kinetic energy (perhaps, potential also) under the action of the static field of the target. 106 Atomic Bremsstrahlung: retrospectives, current status and perspectives The properties of this BrS are well investigated, presented and discussed at length in almost all books on Electrodynamics (see e.g. Berestetskii, Lifshits, and Pitaevskii, 1974). <...> Thus, it is well known that BrS intensity is proportional to 2 ep and inversely proportional to m . <...> These features, particularly the latter 2 p one, very often serve even as a definition of BrS as radiation, whose intensity depends upon 2 m as m− 2 p p (see e.g. Landau and Lifshits, 1988). <...> There are tables of calculated values of BrS intensities generated in electron-atom collisions (see e.g. Pratt et al., 1977 <...>