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Journal of Experimental and Theoretical Physics

Transfer of total angular momentum and quenching of fine-structure component of a Rydberg atom in collisions with neutral particles

Владимир Сергеевич Лебедев, J. George Adashko

Published Jan 1, 1993• 2 citations
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The theory of the J-mixing process for thermal collisions between Rydberg atoms and neutral particles has been developed in the impulse approximation using the formalism of spherical tensor operators and the WKB approximation. The authors have derived a simple formula for the cross section of inelastic nlJ to nlJ' transitions, which provides the dependence on the principal n and orbital l quantum numbers, relative velocity V and the energy defect of the fine-structure splitting. The analytical results obtained are in good agreement with the available experimental data and numerical calculations.

Journal of Physics B Atomic Molecular and Optical Physics•Mar 14, 1992•9 citations
Electron-transfer processes are studied in thermal collisions of Rydberg atoms with alkaline-earth Ca(4s 2), Sr(5s 2), and Ba(6s 2) atoms capable of forming negative ions with a weakly bound outermost p-electron. We consider the ion-pair formation and resonant quenching of highly excited atomic states caused by transitions between Rydberg covalent and ionic terms of a quasi-molecule produced in collisions of particles. The contributions of these reaction channels to the total depopulation cross section of Rydberg states of Rb(nl) and Ne(nl) atoms as functions of the principal quantum number n are compared for selectively excited nl-levels with l ≪ n and for states with large orbital quantum numbers l = n − 1, n − 2. It is shown that the contribution from resonant quenching dominates at small values of n, and the ion-pair formation process begins to dominate with increasing n. The values and positions of the maxima of cross sections for both processes strongly depend on the electron affinity of an alkaline-earth atom and on the orbital angular momentum l of a highly excited atom. It is shown that in the case of Rydberg atoms in states with large l ∼ n − 1, the rate constants of ion-pair formation and collisional quenching are considerably lower than those for nl-levels with l ≪ n.
The theory of the J-mixing process for thermal collisions between Rydberg atoms and neutral particles has been developed in the impulse approximation using the formalism of spherical tensor operators and the WKB approximation. The authors have derived a simple formula for the cross section of inelastic nlJ to nlJ' transitions, which provides the dependence on the principal n and orbital l quantum numbers, relative velocity V and the energy defect of the fine-structure splitting. The analytical results obtained are in good agreement with the available experimental data and numerical calculations.