primary photochemical process (primary photoreaction)

https://doi.org/10.1351/goldbook.P04836
Any elementary chemical process undergone by an electronically excited @M03986@ and yielding a primary photoproduct.
See:
primary (photo)process
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2266 [Terms] [Paper]