ATMOSPHERIC AND ENVIRONMENTAL CHEMISTRY

CHARLES E. KOLB is president and chief executive officer of Aerodyne Research, Inc. Since 1971, his principal research interests at Aerodyne have included atmospheric and environmental chemistry, combustion chemistry, materials chemistry, and the chemical physics of rocket and aircraft exhaust plumes. He has served on several National Aeronautics and Space Administration panels dealing with atmospheric chemistry and global change, as well as on five National Research Council committees and boards dealing with environmental issues. He served as vice chair of the Stockpile Committee from mid-1997 to mid-2000. From 1996 to 1999, he was atmospheric sciences editor for Geophysical Research Letters. In 1997, he received the Award for Creative Advances in Environmental Science and Technology from the American Chemical Society. 

Measurement Challenges and Strategies in Atmospheric and Environmental Chemistry 10 00 DISCUSSION... 

MEASUREMENT CHALLENGES AND STRATEGIES IN ATMOSPHERIC AND ENVIRONMENTAL CHEMISTRY... 

It is clear that innovative instruments and measurement strategies are required to cure the undersampled environment problem. They can be developed and deployed if ongoing advances in a wide range of enabling technologies are adapted and exploited. For many environmental challenges, measurement requirements favor real-time, mobile, autonomous instruments. The resulting quantum leaps in measurement capabilities will have the potential to revolutionize atmospheric and environmental chemistry. 

Abstract The forward and reverse reactions Br + H2. O HBr + OH are important in atmospheric and environmental chemistry. Five stationary points on the potential energy surface for the Br - - H2O HBr -I- OH reaction, including the entrance complex, transition state, and exit complex, have been studied using the CCSD(T) method with correlation-consistent basis sets up to cc-pV5Z-PP. Contrary to the valence isoelectronic F -I- H2O system, the Br -I- H2O reaction is endothermic (by 31.8 kcal/mol after zero-point vibrational, relativistic, and spin-orbit corrections), consistent with the experimental reaction enthalpy. The CCSD(T)/cc-pV5Z-PP method predicts that the reverse reaction HBr -I- HO Br -I- H2O has a complex... 

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