Traditionally, the driving forces for particle growth are attributed to condensation of condensable species following atmospheric oxidation of volatile species by gaseous oxidants. The present study presents experimental evidence of an unaccounted-for new photo-induced pathway for particles growth in the absence of a gas phase. In the present work, we investigated how photosensitized processes may also contribute to organic aerosol growth in the troposphere. Condensed phase chemistry of glyoxal contributes to the formation of light absorbing compounds, such imidazol carboxaldehyde (IC) which is demonstrated to be an efficient photosensitizer. Its triplet state chemistry is shown to favour the fast uptake of non-condensable VOCs. Growth rates measured by means of an aerosol flow tube, combined with high resolution MS analytics performed with an Orbitrap and finally triplet-state quenching kinetics (Laser photolysis) will be presented. These measurements enable us to present a reaction mechanism that in addition of favouring condensed phase chemistry may also have feedbacks into the gaseous oxidation capacity through the production of radicals. Current data will be presented and discussed.