Fig. 2: The Higher Aldehyde Mechanism (HAM) and its contribution to OH regeneration.
From: Reactive aldehyde chemistry explains the missing source of hydroxyl radicals
a The detailed HAM processes that produce OH radicals, here take valeraldehyde as an example. Step 1 shows the chemical processes of ·OR(CO)OOH radical formation; Step 2 shows the two steps of H-migration to produce hydroperoxyl-carbonyls (HPC); Step 3 presents the HPC photolysis to produce OH radical. b The relative contributions of known and unclassical OH sources. c The relative contributions of the Leuven Isoprene Mechanism updated version 1 (LIM1) and HAM to the unclassical OH sources. The error bars denote the standard deviation.
