Abstract
We present a theoretical analysis of the transient population inversions which appear in the optically pumped thallium (6 2 P 1/2 , 6 2 3/2 , 7 2 S 1/2 ) atom. We account for the hyperfine structure and we assume that the pumping occurs in the presence of buffer gas. Numerically computed time dependencies of population differences between the Zeeman sublevels of hyperfine levels of the 7 2 S 1/2 and 6 2 P 1/2,3/2 states are given. It is demonstrated how the described effects depend on the strength of the atom-field coupling and buffer gas pressure. The role of resonant and nonresonant pumping is explained
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