Phys. Rev. Lett. 80, 680–683 (1998)Electrodynamics of Helium with Retardation and Self-Interaction EffectsReceived 25 June 1997; published in the issue dated 26 January 1998 We show that an extra constant of motion with an analytic form can exist in the neighborhood of some discrete circular orbits of helium when one includes retardation and self-interaction effects. The energies of these discrete stable circular orbits are in the correct atomic magnitude. The highest frequency in the stable manifold of one such orbit agrees with the highest frequency sharp line of parahelium to within 2%. The generic term of the frequency in the stable manifold to higher orbits is also in agreement with the asymptotic form of quantum mechanics for helium. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.680
DOI:
10.1103/PhysRevLett.80.680
PACS:
31.15.Ct, 03.20.+i, 05.45.+b
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