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Journal of Experimental and Theoretical Physics Letters

The mixing of metastable states of barium atoms induced by the ac Stark effect

І. І. Бондар, В. В. Суран

Published Jan 1, 2000• 1 citation
Publisher

Abstract

We present the results of experimental investigations of atoms perturbed by laser radiation under conditions when the energy of a Stark-shifted level becomes close to the energy of a neighboring level.
DOI
10.1134/1.568274

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The influence of an additional perturbation (the ac Stark effect) of neutral barium atoms on the formation of doubly charged ions in the course of ionisation of these atoms by visible light (by the second harmonic radiation of an yttrium-aluminium garnet laser) was investigated experimentally. The frequency-tunable radiation of a colour-centre laser (ω = 8500 — 8950 cm -1 ) was used in these investigations to effect the additional perturbation of barium atoms. It was found that this perturbation changed the mechanism of formation of the doubly charged Ba 2+ ions from a stepwise to a two-electron mechanism. The yield of the Ba 2+ ions increased sharply under these conditions.
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The stimulated radiative corrections (or ac-Stark shift, or light shift...) of the energy levels of a hydrogenic atom irradiated by an intense, nonresonant, monomode laser field, are evaluated within the framework of the time-dependent perturbation theory, up to and including fourth order. The calculation is performed by using a Sturmian representation of the Coulomb Green's function. Whenever it is possible, comparison is made with other results, and several limiting cases are considered. If the laser frequency $\ensuremath{\omega}\ensuremath{\rightarrow}0$, one recovers the results of the dc-Stark effect. If $2\ensuremath{\omega}$ becomes larger than the ionization energy of the atomic state considered, the fourth-order level shift acquires an imaginary part which may be connected, via an extension of the optical theorem, to the two-photon ionization cross section. We point out also the difficulties encountered, when trying to get sensible estimates from partial summation of the infinite sums entering the perturbative expression of the fourth-order amplitudes. Finally, the order of magnitude of these various corrections is discussed.