Matrix isolation study of the thermal and photochemical reaction of ozone with Trimethyl Indium

► First identification of monomeric H3COIn(CH3)2. ► Spectroscopic and theoretical characterization of H3COIn(CH3)2. ► Identification of downstream products of the reaction of O3 with (CH3)3In. ► Clarification of the initial steps in the mechanism of the gas phase reaction.