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We report on an experiment in which the fluorescence decay time of 5P levelsof Rb atoms in a coated vapor cell exceeds several of milliseconds, many ordersof magnitude longer than normal decay time of excited of rubidium atoms. Wefound that this peculiarly long - term decay is not exponential and can only beobserved in a high quality coated cell with a long lifetime of optical pumpedatoms on atomic ground-state sublevels. A numerical simulation based on acomplete density matrix is presented. It supports the population pumpingprocess through the ground-state sublevels of Rb atoms as the most plausiblemechanism for the observed phenomenon and it consistently demonstrates all therelevant features of the experiment. The investigation can be used, forexample, to explore the quality of a various anti-relaxation coatings used forthe resonant cells.

Peculiar long-term fluorescence of Rb atoms in coated vapor cell with internal atomic source