A potential high-efficiency Cl2 ultraviolet laser

Abstract
An emission band extending from 2200 to 3000 Å has been observed following proton beam excitation of Ar‐Cl2 mixtures which is much more intense than the emission from Ar‐N2. The emission band was assigned to a bound‐free transition in the chlorine molecule. The energy precursor of excited Cl2 is the excimer Ar2* which emits a 1300‐Å continuum. Ion‐ion recombination can also contribute to this excited chlorine molecule. The emission continuum near the 1750 Å associated with ArCl* was also investigated.