Absorption cross sections of O₂ (left) and O₃ (right), both plotted on the same y-axis scale to enable easier comparison. The y-axis is the same for both to enable easier comparison. Relevant O₂ bands are the Schumann-Runge continuum (137–175 nm), the Schuman-Runge bands (175–200nm), and the Herzberg continuum (195–242nm). For less than 175nm an excited O atom, the O(¹D) radical, is formed along with a ground state O atom during photolysis. O₃ bands are the Hartley bands (200–300 nm), the Huggins bands (310–350 nm), and the Chappuis bands (410–750 nm). Photolysis within the Hartley bands will produce the O(¹D) radical while other O₃ bands create a ground state O atom. Absorption cross section data is from Brasseur & Solomon (2005).