Editing Ozone–oxygen cycle (section)

===Creation===
An oxygen molecule is split ([[Photolysis|photolyzed]]) by higher frequency UV light (top end of [[UV-B]], [[UV-C]] and above) into two oxygen atoms (see figure):
:1. '''oxygen photodissociation''': O<sub>2</sub> + ℎν<sub>(<242&nbsp;nm)</sub> → 2 O
Each oxygen atom may then combine with an oxygen molecule to form an ozone molecule:
:2. '''ozone creation''': O + O<sub>2</sub> + A → O<sub>3</sub> + A
:where A denotes an additional molecule or atom, such as N<sub>2</sub> or O<sub>2</sub>, required to maintain the conservation of energy and momentum in the reaction. Any excess energy is produced as [[kinetic energy]].