What is the chemical compound for argon?

Argon Fluorohydride (HArF). It was discovered in 2000 by scientist from the University of Helsinki in Finland. They shone a strong ultraviolet light on frozen argon particles that contained a small amount of hydrogen fluoride. The light split some of the hydrogen fluoride molecules into hydrogen and fluorine atoms, which then mixed with argon to form the new compound Argon Fluorohydride.