photochemistry

https://doi.org/10.1351/goldbook.P04588
The branch of chemistry concerned with the chemical effects of light (far UV to IR).
See: photochemical reaction
Source:
PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2259 (https://doi.org/10.1351/pac199668122223)