+ -. 10 -15. + -. + -. Exciton Formation. +. -. -. +. 10 -12. -. +. Carrier Migration & Trapping. Time (sec). +. -. -. +. +. 5. -. 10 -9. Solvent Oxidation. H 2 O. 4. -. 3. +. mOD. -. 2. MeOH /H 2 O. Electron-Hole Recombination. 1. 10 -6. 0. -0.5. 0. 0.5.
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PHOTOCHEMICAL SMOG. Swagath Navin Manohar. Contents. Smog Physical Significance Photochemical Smog Topography & Meterology Future Scope Summary. 1. Smog. Orginally phrased by Dr.Henry Antoine Des Voeux Mixture of Smoke and Fog Famous Smogs -London or The Classical Smog
Photochemical kinetics. Intensity. Transmittance. Absorbance. Why LOG?. Transmittance. Absorbance. Beer’s Law. dP( x )/dx = - κ P( x ). P( x ) = exp(- κ x ). Beer’s law. Cross section ~10 -18 cm 2. Molar extinction Coefficient ~250 L.mol -1 cm -1. ε = 313 M -1 cm -1
Bailey, Clark, Ferris, Krause and Strong, “Chemistry of the Environment,” second edition (San Diego: Academic Press) 2002. Photochemical Smog:. [O 3 ] depends on the ratio. and on [VOC]. Generally, [VOC] [O 3 ] BUT. If VOC are in excess, changing [VOC]
Photochemical Smog. By: Gurjot Singh and Garry Troung. What is Photochemical Smog ?. Photochemical Smog is a type of air pollution that is a combination of pollutants (in the form of smoke) and fog.
PHOTOCHEMICAL SMOG DISCOVERED. TRANSFORMATION. The 20 th century has been characterised by a transition from urban air dominated primary pollutants to one where secondary pollutants are very important. . Who Framed Roger Rabbit?. LOS ANGELES EARLY 1940s. Vanishing streetcars.
BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS. DEPARTMENT OF CHEMICAL AND ENVIRONMENTAL PROCESS ENGINEERING. FACULTY OF CHEMICAL AND BIOCHEMICAL ENGINEERING. HYDROCARBONS AND PHOTOCHEMICAL OXIDANTS. Authors: Dr. Bajnóczy Gábor Kiss Bernadett.
Photochemical processes on Titan. A Revision from Cassini Observations Cheng Li 1 , X. Zhang 1 , J. A. Kammer 1 , M. C. Liang 2 , Y. L. Yung 1. 1 California Institute of Technology 2 Research Center for Environmental Changes, Academia Sinica , Taiwan. P hotochemistry on Titan.
PHOTOCHEMICAL SMOG & OZONE. Primary Pollutant. Dangerous substance when emitted into the atmosphere Directly cause lung damage and respiratory distress NOx VOCs PM 2.5 PM 10. Secondary Pollutant.
6. Atmospheric Photochemical Reactions. 6.1 Introduction 6.2 Thermodynamics of photochemical reactions 6.3 Monatomic oxygen and ozone formation 6.4 Role of oxides of nitrogen in photo-oxidation 6-5. Hydrocarbons in atmospheric photochemistry 6-6 Hydrocarbon reactivity
Photochemical processes on Titan. A Revision from Cassini Observations Cheng Li, X. Zhang, J. A. Kammer , M. C. Liang, Y. L. Yung. 1California Institute of Technology 2Research Center for Environmental Changes, Academia Sinica, Taiwan. 2. P ho t o c h em is tr y o n Ti tan.