Abstract
Niels Bohr and Arnold Sommerfeld developed their model of the hydrogen atom and other one-electron atoms based on the concepts of discrete, stationary states and quantized energies and angular momenta of these atoms. Every stationary state carried its own constants of motion, to each of which corresponded a quantum number. Transitions between stationary states corresponded to sudden changes in the values of constants of the motion and of the corresponding quantum numbers, and to the absorption or emission of radiation to maintain conservation of energy.
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Berry, R.S. (1995). Probing The Collective and Independent-Particle Character of Atomic Electrons. In: Calais, J.L., Kryachko, E.S. (eds) Structure and Dynamics of Atoms and Molecules: Conceptual Trends. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0263-6_6
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