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Photochemistry: Ozone Formation and Depletion

Photochemistry: Ozone Formation and Depletion. Nick Buker. Relationship between Wavelength and Energy. Spectroscopy and Photochemistry. Spectroscopy – The study of the interaction between light and matter. Photochemistry – The study of chemical reactions initiated or driven by light.

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Photochemistry: Ozone Formation and Depletion

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  1. Photochemistry:Ozone Formation and Depletion Nick Buker

  2. Relationship between Wavelength and Energy Created by Nick Buker 4/18/13

  3. Spectroscopy and Photochemistry Spectroscopy – The study of the interaction between light and matter. Photochemistry – The study of chemical reactions initiated or driven by light. Created by Nick Buker 4/18/13

  4. Light-induced Bond Breakage • Breaking bonds requires energy and forming bonds releases energy • Light can break bonds and initiate chemical reactions • If O=O bond energy is approximately 498kJ/mol, what is the maximum wavelength of light capable of breaking this bond in nm? Created by Nick Buker 4/18/13

  5. Calculations (Ultraviolet) Created by Nick Buker 4/18/13

  6. Mechanism of Ozone formation in the Upper Atmosphere Created by Nick Buker 4/18/13

  7. Chlorofluorocarbons • Dipole-dipole attractions allow CFC’s to liquify at moderate pressure • Used as propellants and refrigerants • Peak global production exceeded 1 million metric tons annually Created by Nick Buker 4/18/13

  8. Destruction of Ozone by Chlorofluorocarbons Created by Nick Buker 4/18/13

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