The study of reactive species remains a challenge under ambient conditions owing to their extremely shorter life times. The advent of technique of matrix isolation changed the scenario as the reactive species produced will have a long life time due to the cage effect of matrixes and low temperatures. Of many possible routes for the generation of reactive species, electron impact seems to be very attractive as the tunability of electron energy results in the selective fragmentation of the bonds. In this work, the electron gun assembly developed in house for the generation of reactive species was coupled with matrix isolation infrared facility for trapping and studying the species under the influence of matrixes. The reactive species formed out of chlorocarbons were investigated. Subsequently, the feasibility of producing nascent oxygen atoms and ozone through electron bombardment of O2 molecule was investigated with a special emphasis on ‘dark’ oxidation.