Schumann–Runge bands

The Schumann–Runge bands refer to a set of molecular absorption bands associated with the electronic transitions of molecular oxygen (O₂) and, to a lesser extent, ozone (O₃). These bands are named after the German physicists Hermann Schumann and Wilhelm Runge, who studied these phenomena in the early 20th century. The Schumann–Runge bands occur in the ultraviolet region of the electromagnetic spectrum, usually between 175 nm and 205 nm.