Chlorofluorocarbons and Ozone

State-selective enhanced production of positive ions and excited neutral fragments of gaseous CH2Cl2following ClLu1, Chen2, Lee3 et al. 2010Phys. Rev. A

“…This research is increasingly connected with the investigation of small halogenated free radicals and ions via photoionization or photolysis of these halogenated molecules. The chemistry of these species and the chemical processes induced on their photolysis in the atmosphere are important for several reasons, but primarily because of their catalytic contribution to the depletion of the atmospheric ozone layer [21]. In the present work, we investigated the dissociation dynamics of ionic and excited neutral fragments of gaseous CH 2 Cl 2 following photoexcitations of Cl 2p electrons to various resonances by combining measurements of photoninduced ionic dissociation, x-ray absorption, and uv-visible dispersed fluorescence.…”

Environmental Attributes to Respiratory Diseases of Small Ruminants

“…This book detailed the environmental impacts of the indiscriminate spraying of DDT in the USA and questioned the logic of releasing large amounts of chemicals into the environment without fully understanding their effects on ecology or human health. Similar stories are now around the world in respect to chlorofluorocarbons and other atmospheric pollutants that are accepted as greenhouse gases or scavengers of stratospheric ozone [52] and perhaps also endocrine disruptors [53]. …”

Ab Initio Calculations for Kinetic Modeling of Halocarbons

“…This is equalto the endothermicity at 298 K based on D 298 (HO-I) = 216 kJ mol" 1(52). 4(B) shows that, by contrast to H atom attack, the bond that is more reactive towards OH is the stronger C-H bond and that CH2 I + H 2 0 formation, the more exothermic channel, is expected to dominate at all temperatures. A check on the reliability of the kinetic calculations is comparison with the measurements of the total removal rate constant k 12 = k 12a + k 12b made by Brown et al (53).…”