Time-dependent effects in near-resonant scattering of laser light on the three-level atom: I. phenomenological description

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Abstract
The density-matrix approach is used to describe the dynamics of thallium-type dressed atoms in a gaseous environment. The effects of spatial degeneracy are accounted for. It is shown that the stationary contribution to the spectrum is not always dominant and may even be negligible. Thus, a consistent description requires the use of the time-dependent spectrum such as that of Eberly and Wodkiewicz (1977). In this connection a new interpretation of the experiment on near resonant scattering of light on thallium-type atoms is proposed.