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On Langmuir's periodic orbit

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arxiv 2108.13762 v3 pith:PJZWIMC7 submitted 2021-08-31 math.SG math-phmath.MP

On Langmuir's periodic orbit

classification math.SG math-phmath.MP
keywords periodiclangmuirorbitatomexistenceanalyticapplyapplying
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Niels Bohr successfully predicted in 1913 the energy levels for the hydrogen atom by applying certain quantization rules to classically obtained periodic orbits. Many physicists tried to apply similar methods to other atoms. In his well-known 1921 paper, I.~Langmuir established numerically the existence of a periodic orbit in the helium atom considered as a classical three body problem. In this paper we give an analytic proof of the existence of Langmuir's periodic orbit.

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