Thallium bromoiodide / thallium bromide iodide () and thallium bromochloride / thallium bromide chloride () are mixed salts of thallium(I) that are used in spectroscopy as an optical material for transmission, refraction, and focusing of infrared radiation. The materials were first grown by R. Koops in the laboratory of Olexander Smakula at the Carl Zeiss Optical Works, Jena in 1941.
Thallium bromoiodate / thallium bromide iodate () and thallium bromochlorate / thallium bromide chlorate () are mixed salts of thallium(I) that serve as optical materials in spectroscopy for the transmission, refraction, and focusing of infrared radiation. These compounds were initially synthesized by R. Koops in the laboratory of Olexander Smakula at the Carl Zeiss Optical Works, Jena in 1941.