A process is discussed which could lead to laser oscillation in the uv, employing vibrational energy levels in different electronic states of a diatomic molecule. A pulse from a Lyman discharge tube is passed through AgCl vapor. Absorption and subsequent fluorescence occur and analysis of the resulting output pulse, together with previously measured values of the lifetimes involved, enable the populations of eight vibrational energy levels to be computed. No inversion is found to occur between the two electronic states but inversions 5 × 109mol/cm3 are found to occur between pairs of vibrational levels in the same electronic state.
L. Allen and D. G. C. Jones, "Vibrational Energy Level Population in Optically Pumped AgCI Vapor," Appl. Opt. 6, 1545-1548 (1967)