Abstract
Radiative transitions in atoms and atomic particles result from interaction between the radiation field and atomic electrons. Representing an atom as a system of electrons located in the Coulomb motionless center, we have that bound atomic states has a discrete character and bound energy states are described by certain quantum numbers. A weakness of interaction between an atom and radiation field follows from a small velocity of bound electrons compared to light speed. Therefore, parameters of radiative transitions in atoms may be determined within the framework of the perturbed theory of quantum mechanics. This approach exhibits that dipole transitions are the strongest one and allows one to analyze the character of atom spectroscopy which including the selection rule and the sum rules. Some applications of atom spectroscopy are based on a narrow width of spectral lines for transitions between discrete states of atomic particles.
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Krainov, V., Smirnov, B.M. (2019). Single-Photon Transitions of Atomic Particles. In: Atomic and Molecular Radiative Processes. Springer Series on Atomic, Optical, and Plasma Physics, vol 108. Springer, Cham. https://doi.org/10.1007/978-3-030-21955-0_1
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DOI: https://doi.org/10.1007/978-3-030-21955-0_1
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