The unimolecular decomposition of ortho-benzyne was investigated behind reflected shock waves by taking 1,2-diiodobenzene as the thermal source. The initial concentration of ortho-benzyne was determined in situ with I-ARAS. Simultaneously, the progress of reaction was monitored by measuring the produced H atoms with H-ARAS. By reproducing the experimental H atom concentration time profiles, a two channel decomposition model of ortho-benzyne was developed.
By investigating the thermal decomposition of phenyl and benzene, a complete detailed chemical reaction model was elaborated which is able to capture the measured H atom concentration profiles over the whole investigated parameter range.
Thus, the present work may contribute to a better understanding and describing of high temperature combustion of aromates which are considered as major soot precursors.