Non-radical reaction kinetics
Besides the degradation of organic substances in the troposphere by radical reactions like OH and NO3, further non-radical interactions with oxidants like ozone and hydrogen peroxide (H2O2) take place. These reactions occur comparatively slow but may provide huge turnovers since the concentrations of ozone and H2O2 exceed those of the radicals in a cloud droplet by far (about several orders of magnitude). Furthermore, so called “accretion reactions” are investigated where two or more molecules add to each other leading to products of higher molecular weight. Kinetic and mechanistic studies are conducted using UV/Vis spectroscopy (dual-beam spectrometer and Stopped Flow, Figure 1) as well as capillary electrophoresis.