Abstract
Several useful expressions for the population ratios of collisionally excited levels have been derived and different transitions of Tl and Ga atoms, seeded in a premixed atmospheric flame, have been excited in order to verify that the levels higher than the laser-excited level are populated approximately according to a Boltzmann equilibrium. This result confirms the possibility of using thermally assisted flourescence lines to measure local temperatures in flames. The Einstein spontaneous emission probability for the transition 6 S 1/2→4 P 3/2 at 2719.65Å of Ga has also been calculated ( A 2719.65=0.41×10 8 s -1) to fit the experimental point.
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