photocatalytic centre

https://doi.org/10.1351/goldbook.14043
Surface centre, i.e., a surface defect or a regular surface site, in an active or electronically excited state at which a chemical transformation takes place.
Source:
PAC, 2011, 83, 931. (Glossary of terms used in photocatalysis and radiation catalysis (IUPAC Recommendations 2011)) on page 968 [Terms] [Paper]