photochemistry

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
See also:
PAC, 1990, 62, 2167 (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2206