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Atoms, Molecules ze,,oo r,, and ClustersThis work is an extension of the previously developed description [1, 2] of the pulsed-light near-resonant scattering on an optically active atom --inert gas system for the case of an alkali metal atom. The alkali metal atom is assumed to be three level system, i.e. the ground state Sa/2 and two excited states Pa/2 and P3/2. The results, expressed in terms of the cross-sections and energy spectrum, are partially compared with some experimental results and theoretical calculations for stationary beam scattering.

The interaction of an alkali-metal atom with two different color laser beams is analyzed. The quantum interference effect is studied in weak and strong field limits. Our theoretical results are related to the recent experimental data for the S 1/2 →S 1/2 two-photon transition in Na and Rb atoms. It is shown that the interference profile becomes narrow for moderately strong fields and the destruction of the interference is predicted for very strong ones. The electromagnetically induced interference effects are analyzed. The role of the relaxation processes is examined.

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