IPA: /ˌfoʊtəˈlɪtɪkli/
KK: /fōˈtōlɪtɪkli/
In a way that involves the process of breaking down substances using light energy.
The chemical reaction occurred photolytically, leading to the formation of new compounds.
Photolytically → It is formed from "photo-" (from Greek "phōs", meaning light) and "lytic" (from Greek "lytikos", meaning capable of loosening or breaking down). The word "photolytically" refers to processes that involve breaking down substances using light.
Think of 'light' ('photo-') being used to 'break down' ('lytic') substances — that's what photolytically means.