  We observed and modeled time-resolved laser-induced incandescence (LII)
signals from soot aggregates. Time-resolved LII signals were observed from
research-grade soot particles, levitated in room temperature air. We were able
to measure sizes and structural properties of our soot particles ex situ, and
use those measurements as input parameters when modeling the observed LII
signals. We showed that at low laser fluences, aggregation significantly
influences LII signals by reducing conductive cooling to the ambient air. At
moderate laser fluences, laser-induced disintegration of aggregates occurs, so
the effects of aggregation on LII signals are negligible. These results can be
applied to extend LII for monitoring formation of soot and nanoparticle
aggregates.
