Series of molecular-like doubly excited states of a quasi-three-body Coulomb system

• URL: http://arxiv.org/abs/2506.13495v1
• Date: Mon, 16 Jun 2025 13:52:22 GMT
• Title: Series of molecular-like doubly excited states of a quasi-three-body Coulomb system
• Authors: Matthieu Génévriez, Maxence Jungers, Christian Rosen, Ulrich Eichmann,
• Abstract summary: We investigated resonant multiphoton excitation of high-angular-momentum planetary states of the strontium atom.<n>A series of highly doubly excited electronic states converging to the double ionization threshold was identified and reproduced by first-principles calculations.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: We investigated resonant multiphoton excitation of high-angular-momentum planetary states of the strontium atom, a quasi-three-body Coulomb system, both experimentally and theoretically. A series of highly doubly excited electronic states converging to the double ionization threshold was identified and reproduced by first-principles calculations, which provided access to the two-electron wavefunctions of the resonances. In these states, the outer electron is dynamically localized at large distances by pendulum-like oscillations of the inner electron across the nucleus. A complementary simple molecular-like adiabatic model offers a clear interpretation of the correlated two-electron motion and suggests that the series is a general feature of highly doubly excited states of atoms and molecules.

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