Ultraviolet ion laser performance and spectroscopy for sulfur, fluorine, chlorine, and bromine

The performance and spectroscopy was investigated for ultraviolet ion laser transitions in fluorine, chlorine, bromine, and sulfur. Three new transitions were found in bromine below 280 nm and 60-W peak power was observed for the strongest new line in Br IV? at 236.2465 nm. The wavelengths for the new and previously known transitions were measured to about 0.001 nm. Performance was optimized using a 7-mm bore 150 cm arc-length tube using a fast longitudinal discharge for excitation.