Possibility of population inversion as a result of dissociation of bromine iodide by solar radiation

An analysis of the rate equations is used to demonstrate that, in principle, it should be possible to invert the populations of fine-structure levels of the Br atom in the course of photodissociation of bromine iodide with solar radiation. The threshold conditions for lasing are calculated. A way of constructing a laser system is suggested. The forecast value of the efficiency of such systems is ~0.5%.