Figure 1: Polycyclic aromatic hydrocarbons (PAHs) on uncoated soot particles.
From: Connecting the oxidation of soot to its redox cycling abilities
(a) Typical SP–AMS (soot-particle aerosol mass spectrometer) spectrum (obtained with the laser vaporizer) of organic species (green) and elemental carbon species (Cx, black) in soot particles used in this work. Highlighted in orange are the species considered to be PAHs and in pink those considered to be quinones. (b) AMS (aerosol mass spectrometer) spectrum (obtained with the thermal vaporizer) for the soot, (c) Typical time evolution of the SP–AMS signals normalized to elemental carbon of PAHs at 1.5 × 1012 molecule cm−3 O3 (pink), at 3.4 × 1012 molecule cm−3 O3 (light blue) and at 1.1 × 1013 molecule cm−3 (dark blue), and quinones at 1.1 × 1013 molecule cm−3 O3 (red); t=0 min is the time at which O3 was added to the chamber.
