The present volume is devoted to the transitions in hydrogen-like atoms, also called hydrogenic atoms. One means by hydrogenic atom, an atom considered as owning one electron as the hydrogen atom. It is the case for an atom whose all the electrons, except one, are not considered, either because they have been thrown out or because their action is neglected.
Corrective terms taking into account this action, or the size of the nu cleus, may be used. But they are obtained by means of approximative instead of exact calculations, and they will not be taken into consideration in our elementary presentation.
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(2009). Introduction. In: Relativistic Transitions in the Hydrogenic Atoms. Springer Series on Atomic, Optical, and Plasma Physics, vol 52. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-85550-7_1
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