photodissociate
/ˌfəʊtə(ʊ)dɪˈsəʊʃɪeɪt/ /ˌfəʊtə(ʊ)dɪˈsəʊsɪeɪt/Chemistry
verb
[with object] To dissociate by means of light. Also without object: to undergo photodissociation.
Origin
1940s; earliest use found in Proceedings of the Royal Society of London. From photo- + dissociate, after photodissociation.