chain carrier

https://doi.org/10.1351/goldbook.C00949
A species, such as an atom or
free radical
, which is involved in
chain-propagating reactions
is known as a chain
carrier
.
Source:
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 156 [Terms] [Paper]