On Langmuir's periodic orbit
arXiv:2108.13762 · doi:10.1007/s00013-022-01709-1
Abstract
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.
12 pages, 2 figures. We would like to thank C.Viterbo for pointing out a mistake in our description of the historical development of Symplectic Geometry. This version appeared in Archiv der Mathematik