“…Measurements [5,6] and modeling studies [7][8][9][10] have addressed the physical and dynamical processes of soot formation from the initial gas phase species. Determination of soot inception, the location in the flame zone where it occurs, and the conditions under which it begins is complicated by the fact that many of the PAHs that contribute to the soot formation process, and many of the species (and the reactions) involved in the chemical reactions leading to soot formation, are still unknown [11].…”