![]() At the time of incandescence the ratio of light scattering to incandescence from these particles was up to 2-fold greater than from soot (BC). Only a subset of tar brC particles exhibited detectable incandescence (70 % by number) for these particles the ratio of incandescence to light scattering was much lower than that of soot black carbon (BC). We then show that tar brC results in unique SP2 signals due to a combination of complete or partial evaporation, with no or very little incandescence. As recent studies have defined tar brC in different ways, we begin by reviewing the literature and proposing a material-based definition of tar. We investigate the possibility that the refractory, infrared-light-absorbing carbon particulate material known as "tarballs" or tar brown carbon (tar brC) generates a unique signal in the scattering and incandescent detectors of a single particle soot photometer (SP2).
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