Photodissociation of Thallium Bromide and Cesium Bromide

Photodissociation of TlBr and CsBr by the 1850-Å mercury resonance line could lead to laser transitions at 5350 Å and 2.93 μ in Tl and Cs, respectively. The transition probabilities of Cs are such that radiative decay will maintain a population inversion between the 72P3/2 and 72S½ levels. Calculations indicate that a gain of 4% per m is expected at a temperature of 890° for photodissociation into the 72P3/2, ½ Cs levels. In Tl, however, the 62P3/2 level is metastable. A suitable quenching gas must be found before oscillation is possible at 5350 Å from photodissociation into the 72S½ level. Nitrogen and CO2 have been tried thus far without success.