Role of the III(1/2) -II(1/2) transition in rare-gas–halide kinetics

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Abstract
Rare‐gas–halide spectra have previously been analyzed in terms of the strong III (1/2) ‐I (1/2) lasing transition and the weaker II (3/2) ‐I (3/2) broad continuum. However, the III (1/2) ‐II (1/2) transition is also a broad continuum that strongly overlaps the II(3/2) ‐I(3/2) transition and has an Einstein coefficient of a similar magnitude. The existence of this transition requires a reinterpretation of previous kinetic data on ArF, KrF, XeF, and XeCl. Simultaneous energy extraction from both the III (1/2) and II(3/2) states should be possible for lasing in the broad continuum.