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We have studied modification of the fluorescence spectra of aroom-temperature atomic rubidium vapor in the region of $^{85}$Rb and $^{87}$RbD$_2$ line while changing the temporal rate of linear (triangular) scanning oflaser radiation frequency. Increase of the ramping speed over certain value($\approx$ 10$^6$ MHz/s) results in essential modification of magnitudes ofindividual atomic transitions, different on rising and falling slopes, whichcharacterize transition from a steady-state interaction regime to a transientone. Our experimental results are well consistent with the developedtheoretical model. The obtained results can be used for determination of atomicsystem parameters such as ground-state relaxation rate. Possible follow-upactions on addressed control of atomic levels population is discussed.

Fluorescence of rubidium vapor in a transient interaction regime