Collisional destruction of circular Rydberg states by atoms with small electron affinities

  • Elena S. Mironchuk
  • Alexander A. Narits
  • Vladimir S. Lebedev
Regular Article

Abstract

The results of theoretical studies of interaction between neutral targets with small electron affinities and Rydberg atoms in circular states are reported. The cross sections of collisional destruction of such states due to the resonant quenching mechanism are calculated on the basis of the semiclassical theory of nonadiabatic transitions between the ionic and Rydberg covalent terms of a quasimolecule combined with recently developed technique for exact evaluation of matrix elements. We obtain the basic formula for the square of the coupling parameter involving Rydberg nlm-state with the given values of the principal, orbital, and magnetic quantum numbers. It is employed for the derivation of explicit expressions for transitions from circular states applicable in cases of s- and p-states of negative ion temporarily formed during a collision of atoms. Numerical calculations are carried out for thermal collisions of Li and Na atoms with Ca(4s 2) and Sr(5s 2). We explore n-, l-, m-, and velocity-dependences of the cross sections and analyze orientation effects in such collisions. Cross sections of resonant quenching for circular states (l = |m| = n − 1) are shown to be much smaller than those for states with small l values and typically two times lower than for nearly-circular states (l = n − 1) averaged over m.

Keywords

Atomic and Molecular Collisions 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Elena S. Mironchuk
    • 2
  • Alexander A. Narits
    • 1
    • 2
  • Vladimir S. Lebedev
    • 1
    • 2
  1. 1.P.N. Lebedev Physical InstituteMoscowRussia
  2. 2.Moscow Institute of Physics and Technology (State University)Moscow RegionRussia

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