Studies of Noble Gas-Halide Systems

The relatively recent development of a new class of chemical laser based on the formation of noble gas-halide exciplexes and producing coherent radiation at a number of different u.v. wavelengths has been quickly adopted by both kineticists and spectroscopists. This Section brings together a few studies which have appeared in the past year dealing with the properties (i.e., kinetics, photophysics, etc.) of complexes important in the noble gas-htilide systems. The numerous articles that have appeared giving details of performance characteristics of such lasers (and their improvement) are deemed to be beyond the scope of this Report and are not included. However, the proceedings of two recent conferences on lasers have been published in which much of this information can be found. 

Lasers, 1981 (publ. 1982) A.J.P. Conf. Proa. 1983, 100 (Exdmer Lasers). 

Two distinct XeBr formation processes in electron-beam-excited Xe-Br2 mixtures have been identified in nanosecond pulse radiolysis experiments. One formation process, involving ion recombination, could be slowed relative to the second process, involving excitation energy transfer from Xe to Brz, by using very low electron-beam intensities, thereby allowing a kinetic analysis of the second process to be made. XeBr (B) emission at 280 nm has been observed following 193 nm excitation of IBr in Xe-IBr mixtures.  

The mechanism of Xel(B) cxciplex formation following irradiation of Xe-l2 mixtures between 110—195 nm has been studied by Bibinov et Emission bands at ca. 250 nm (B — X) and ca. 320 nm (B — A) were observed as was emission from Xc2l at 300—400 nm, resulting from Xel fluorescence quenching by Xe. 

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