# PHOTODISSOCIATION OF OZONE AT 248 nm

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 Title: PHOTODISSOCIATION OF OZONE AT 248 nm Creators: Wine, P. H.; Ravishankara, A. R. Issue Date: 1982 Publisher: Ohio State University Abstract: Excitation of $O_{3}$ in the strong Hartley absorption band centered at 255 nm results in dissociation via two energetically and spin allowed channels: [FIGURE]. The branching ratio for production of ground state and electronically excited oxygen atoms is required for understanding ozone spectroscopy and photochemistry, and is a critical parameter in models of atmospheric chemistry. We have monitored $O(^{3}P_{J})$ using time resolved resonance fluorescence detection following 248 nm laser photolysis of $O_{3}/He$ and $O_{3}/He/R$ mixtures $(R = N_{2}, CH_{4})$. From these data, the fraction of photodissociation events leading to the production of $O(^{3}P_{J})$, i.e., $\Phi [O(^{3}P_{j})]/\Phi[O(^{1}D_{2})]$. has been determined to be $.103 \pm .131$. This result will be compared with data from other laboratories and its spectroscopic and photochemical implications will be discussed. URI: http://hdl.handle.net/1811/29227 Other Identifiers: 1982-RC-6