The existence of the ClO radical was first suggested in the 1920s, following studies of the photosensitized decomposition of gaseous Cl2O. It was one of the first indirect evidences that a transient species, namely ClO, was involved in the chemistry of this decomposition. The chlorofluorocarbon (CFC) example became a classic example of how man-made materials and our widespread use of them can dramatically affect global chemical processes for a very long time. Cl and Br atoms destroy ozone molecules through a variety of catalytic cycles. In the simplest example of such a cycle, a chlorine atom reacts with an ozone molecule, taking an oxygen atom to form chlorine monoxide (ClO) and leaving an oxygen molecule. The ClO can react with a second molecule of ozone, releasing the chlorine atom and yielding two molecules of oxygen. The ClO and BrO radicals are studied theoretically in this research to discover their molecular properties.
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