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Interaction of Rydberg atoms in circular states with the alkaline-earth Ca(4s 2) and Sr(5s 2) atoms

  • Atoms, Molecules, Optics
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Abstract

The resonant mechanism of interaction of alkaline-earth atoms having a low electron affinity to Rydberg atoms in circular (l = |m| = n–1) and near-circular states has been studied. To describe the dynamics of resonant processes accompanied by nonadiabatic transitions between ionic and Rydberg covalent terms of a quasimolecule, an approach based on the integration of coupled equations for the probability amplitudes has been developed taking into account the possibility of the decay of an anion in the Coulomb field of the positive ionic core of a highly excited atom. The approach involves the specific features of the problem associated with the structure of the wavefunction of a Rydberg electron in states with high orbital angular momenta l ~ n–1. This approach provides a much more accurate description of the dynamics of electronic transitions at collisions between atoms than that within the modified semiclassical Landau–Zener model. In addition, this approach makes it possible to effectively take into account many channels of the problem. The cross sections for resonant quenching of Rydberg states of the Li(nlm) atom with given principal n, orbital l = n–1, and magnetic m quantum numbers at thermal collisions with the Ca(4s 2) and Sr(5s 2) atoms have been calculated. The dependences of the results on n, m, and angle α between the relative velocity of the atoms and the normal to the plane of the orbit of the Rydberg electron have been obtained. The influence of orientational effects on the efficiency of the collisional destruction of circular and near-circular states has been studied. The results indicate a higher stability of such states to their perturbations by neutral particles as compared to usually studied nl states with low values of l (l ≪ n).

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Authors and Affiliations

  1. Lebedev Physical Institute, Russian Academy of Sciences, Leninskii pr. 53, Moscow, 119991, Russia

    E. S. Mironchuk, A. A. Narits & V. S. Lebedev

  2. Moscow Institute of Physics and Technology, State University, Institutskii per. 9, Dolgoprudnyi, Moscow region, 141700, Russia

    E. S. Mironchuk, A. A. Narits & V. S. Lebedev

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  1. E. S. Mironchuk
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Original Russian Text © E.S. Mironchuk, A.A. Narits, V.S. Lebedev, 2015, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2015, Vol. 148, No. 5, pp. 914–930.

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Mironchuk, E.S., Narits, A.A. & Lebedev, V.S. Interaction of Rydberg atoms in circular states with the alkaline-earth Ca(4s 2) and Sr(5s 2) atoms. J. Exp. Theor. Phys. 121, 799–812 (2015). https://doi.org/10.1134/S1063776115110060

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