Ph.D. University of Florida, Gainesville, FL

Atmospheric Chemistry

Atmospheric chemistry via studies in gas phase kinetics and photochemistry, heterogeneous chemistry, atmospheric field observations, and analyses of modeling results; Furthering understanding of the earth’s atmosphere, diagnosing, understanding of, and providing solutions to environmental issues of the stratospheric ozone depletion, air quality, and climate change; Provide new insights into gas phase chemical reactions, reactions on surfaces and in liquids, and photochemical processes; Developing new experimental methods both for laboratory studies and atmospheric measurements.

Ravishankara AR, Daniel JS, and Portmann RW (2009) Nitrous Oxide (N2O): The Dominant Ozone-Depleting Substance Emitted in the 21st Century. Science 326(5949):123-125. Smith I.W.M. and Ravishankara A (2002) Role of hydrogen-bonded intermediates in the bimolecular reactions of the hydroxyl radical. J. Phys. Chem. A 106(19):4798-4807. Brown S, Stark H, Ciciora S, and Ravishankara A (2001) In-situ measurement of atmospheric NO3 and N2O5 via cavity ring-down spectroscopy. Geophys. Res. Lett., 28(17):3227-3230. Brown S, Burkholder J, Talukdar R, and Ravishankara A (2001) Reaction of hydroxyl radical with nitric acid: Insights into its mechanism. J. Phys. Chem. A 105(9):1605-1614. Brown S, Ravishankara A, and Stark H (2000) Simultaneous kinetics and ring-down: Rate coefficients from single cavity loss temporal profiles. J. Phys. Chem. A 104(30):7044-7052 Talukdar R, Longfellow C, Gilles M, and Ravishankara A (1998) Quantum yields of O(1D) in the photolysis of ozone between 289 and 329 nm as a function of temperature. Geophys. Res. Lett. 25(2):143-146. Gierczak T, Burkholder J, Bauerle S, and Ravishankara A (1998) Photochemistry of acetone under tropospheric conditions. Chem. Phys. 231(2-3):229-244. McKeen, S.A., T. Gierczak, J. B. Burkholder, P. O. Wennberg, T. F. Hanisco, E. R. Keim, R.-S. Gao, S. C. Liu, A. R. Ravishankara, D. W. Fahey, (1997) The photochemistry of acetone in the upper troposphere: A source of odd-hydrogen radicals. Geophys. Res. Lett. 24(24):3177-3180. Ravishankara A (1997) Heterogeneous and multiphase chemistry in the troposphere. Science 276(5315):1058-1065. Solomon S, Garcia R, and Ravishankara A (1994) On the role of iodine in ozone depletion. J. Geophys. Res.-Atmospheres 99(D10):20491-20499. Ravishankara A, et al. (1994) Do hydrofluorocarbons destroy stratospheric ozone. Science 263(5143):71-75. Hanson D, Ravishankara A, and Solomon S (1994) Heterogeneous reactions in sulfuric-acid aerosols - a framework for model-calculations. J. Geophys. Res.-Atmospheres 99(D2):3615-3629. Hanson D and Ravishankara A (1994) Reactive uptake of ClONO2 onto sulfuric-acid due to reaction with HCl and H2O. J. Phys. Chem. 98(22):5728-5735. Ravishankara A, Solomon S, Turnipseed A, and Warren R (1993) Atmospheric lifetimes of long-lived halogenated species., Science 259(5092):194-199. Hanson D and Ravishankara A (1992) Investigation of the reactive and nonreactive processes involving ClONO2 and HCl on water and nitric-acid doped ice. J. Phys. Chem. 96(6):2682-2691. Vaghjiani G and Ravishankara A (1991) New measurement of the rate coefficient for the reaction of OH with methane. Nature, 350(6317):406-409. R. Talukdar, A. Mellouki, T. Gierczak, J. B. Burkholder, S. A. McKeen, and A. R. Ravishankara, (1991) Atmospheric lifetime of CHF2Br, a proposed substitute for halons, Science 252(5006):693-695. Hanson D and Ravishankara A (1991) The reaction probabilities of ClONO2 and N2O5 on 40-percent to 75-percent sulfuric-acid-solutions. J. Geophys. Res.-Atmospheres 96(D9):17307-17314. Wine, P. H., A. R. Ravishankara, N. M. Kreutter, R. C. Shah, et al. (1981) Rate of reaction of OH with HNO3. J. Geophys. Res.-Atmospheres 86:1105-1112. Ravishankara A, Nicovich J, Thompson R, and Tully F (1981) Kinetic-study of the reaction of OH with H2 and D2 from 250-K TO 1050-K. J. Phys. Chem. 85(17):2498-2503.