“…Hydrocarbon combustion is a complex process that involves multiple interconnected chemical reactions between hydrocarbon (RH) and atmospheric molecular oxygen (O 2 ) over a wide range of temperatures. 1–3 These highly exothermic reactions occur through a free radical chain mechanism involving the typical steps: initiation, propagation, and termination. 4,5 Hydrocarbon radicals (R˙) are key intermediates in these mechanisms.…”