Spectroscopic studies of diatomic noble gas halides. II. Analysis of bound-free emission from XeBr, XeI, and KrF

The strong ultraviolet emission bands (’’Spectrum I’’) of XeBr, XeI, and KrF have been photographed following electron-beam excitation of appropriate noble gas/halide mixtures at moderate to high pressures. These diffuse spectra are analyzed through trial-and-error theoretical simulations. The upper-state vibrational frequencies are estimated to be 120±10, 112±8, and 310±20 cm−1 for XeBr, XeI, and KrF, respectively. The analysis also yields approximate shapes for the lower-state potential curves in the Franck–Condon region. Lasing is observed in XeBr (2818 Å) and KrF (2484, 2491 Å) but not in XeI.