Physical Chemistry

Professor Stevens' research interests focus on characterizing the chemical mechanisms in the atmosphere that influence regional air quality and global climate change. Much of his group's research is focused on improving our understanding of the influence of biogenic emissions and their oxidation products on the chemistry of the atmosphere. This research involves laboratory studies of the kinetics of important atmospheric reactions, theoretical studies of the reaction mechanisms, and field measurements of the atmosphere in both urban and forested environments.

R. F. Hansen, S. Griffith, S. Dusanter, P. Rickly, P. S. Stevens, S. B. Bertman, M. A. Carroll, M. H. Erickson, J. H. Flynn, N. Grossberg, B. T. Jobson, B. L. Lefer, and H. W. Wallace, Total hydroxyl radical reactivity during CABINEX 2009, Atmospheric Chemistry and Physics Discussions, 13, 17159-17195, 2013 M. A. Navarro, S. Dusanter, and P. S. Stevens, Temperature dependence of the yields of methacrolein and methyl vinyl ketone from the OH-initiated oxidation of isoprene under NOx-free conditions, Atmospheric Environment, 79, 59-66, 2013 S. Griffith, R. Hansen, S. Dusanter, P. S. Stevens, M. Alaghmand, S. Bertman, M. Carroll, M. Erickson, M. Galloway, N. Grossberg, J. Hottle, J. Hou, T. Jobson, A. Kammrath, F. Keutsch, B. Lefer, L. Mielke, A. O'Brien, P. Shepson, M. Thurlow, W. Wallace, N. Zhang, X. Zhou, OH and HO2 radical chemistry during PROPHET 2008 and CABINEX 2009 - Part 1: Measurements and model comparison, Atmospheric Chemistry and Physics Discussions, 12, 33165-33218, 2012 S. M. Dietrick, A. B. Pacheco, P. S. Stevens, and S. S. Iyengar, "Pump-probe" atom-centered density matrix propagation studies to gauge anharmonicity and energy repartitioning in atmospheric reactive adducts: Case study of the OH + Isoprene and OH + Butadiene reaction intermediates, Journal of Physical Chemistry A, 116, 4108-4128, 2012 D. Kim, P.S. Stevens, and R. A. Hites, Kinetic isotope effects and rate constants for the gas-phase reactions of deuterated toluenes with OH from 298-413 K, International Journal of Chemical Kinetics, 44, 821-827, 2012 S. M. Dietrick, A. B. Pacheco, P. S. Stevens, and S. S. Iyengar, The influence of water on anharmonicity, stability and vibrational energy distribution of hydrogen-bonded adducts in atmospheric reactions: Case study of the OH + Isoprene reaction intermediate using ab-initio molecular dynamics, Journal of Physical Chemistry A, 116, 399–414, 2012 X. Zhou, N. Zhang, M. TerAvest, J. Hou, D. Tang, S. Bertman, M. Alaghmand, P. B. Shepson, M. A. Carroll, S. Griffith, S. Dusanter, and P. S. Stevens, Nitric Acid Photolysis on Forest Canopy Surface as a Tropospheric Nitrous Acid Source, Nature Geosciences, 4, 440-443, 2011 M. A. Navarro, S. Dusanter, R. A. Hites, and P. S. Stevens, Radical dependence of the yields of methacrolein and methyl vinyl ketone from the OH-initiated oxidation of isoprene under NOx-free conditions. Environmental Science and Technology, 45, 923–929, 2011 D. Kim, P. S. Stevens, and R. A. Hites, Rate constants for the gas-phase reactions of b-ocimene, β-myrcene, and (E)- β-farnesene with OH and O3 as a function of temperature. Journal of Physical Chemistry A, 115, 500–506, 2011 L. T. Molina, S. Madronich, J. S. Gaffney, E. Apel, B. de Foy, J. Fast, R. Ferrare, S. Herndon, J. L. Jimenez, B. Lamb, A. R. Osornio-Vargas, P. Russell, J. J. Schauer, P. S. Stevens, and M. Zavala. An overview of the MILAGRO 2006 campaign: Mexico City emissions and their transport and transformation. Atmospheric Chemistry and Physics Discussions, 10, 7819-7983, 2010 M. Baasandorj, S. Griffith, S. Dusanter and P. S. Stevens. Experimental and theoretical studies of the kinetics of the OH + hydroxyacetone reaction as a function of temperature. Journal of Physical Chemistry A, 113, 10495-10502, 2009 S. Dusanter, D. Vimal, P. S. Stevens, R. Volkamer, L.T. Molina, A. Baker, S. Meinardi, D. Blake, P. Sheehy, A. Merten, E. Fortner, J. Zheng, R. Zhang, W. Junkermann, M. Dubey, T. Rahn, B. Eichinger, P. Lewandowski, J. Prueger, and H. Holder. Measurements of OH and HO2 Concentrations during the MCMA-2006 Field Campaign: Part 2 – Model Comparison and Radical Budget, Atmospheric Chemistry and Physics Discussions, 9, 9823-9877, 2009 S. Dusanter, D. Vimal, P. S. Stevens, R. Volkamer and L. T. Molina. Measurements of OH and HO2 Concentrations during the MCMA-2006 Field Campaign: Part 1 - Deployment of the Indiana University Laser-Induced Fluorescence Instrument. Atmospheric Chemistry and Physics Discussions, 8, 13689–13739, 2008 D. Vimal, A. B. Pacheco, S. S. Iyengar, and P. S. Stevens. Experimental and ab initio dynamical investigations of the kinetics and intra-molecular energy transfer mechanisms for the OH + 1,3-butadiene reaction between 263 and 423 K at low pressure. Journal of Physical Chemistry A, 112, 7227-7237, 2008 S. Dusanter, D. Vimal, and P. S. Stevens. Measuring tropospheric OH and HO2 by laser-induced fluorescence at low pressure: A comparison of calibration techniques. Atmospheric Chemistry and Physics Discussions, 7, 12877-12926, 2007 M. Baasandorj, and P. S. Stevens. Experimental and theoretical studies of the kinetics of the reactions of OH and OD with 2-methyl-3-buten-2-ol between 300 and 415 K at low pressure. Journal of Physical Chemistry A, 111, 640-649, 2007 D. Vimal and P. S. Stevens. Experimental and Theoretical Studies of the Kinetics of the Reactions of OH Radicals with Acetic Acid, Acetic Acid–d3 and Acetic Acid–d4 at Low Pressure, Journal of Physical Chemistry A, 110, 11509-11516, 2006 M. E. Davis, W. Drake, D. Vimal, and P. S. Stevens. Theoretical and experimental studies of the kinetics of the reactions of OH and OD with acetone and acetone-d6 at low pressure. The Journal of Photochemistry and Photobiology, A: Chemistry, 176, 162-171, 2005 M. E. Davis, C. Tapscott, and P. S. Stevens. Measurements of the kinetics of the OH-initiated oxidation of b-pinene: Radical propagation in the OH + b-pinene + O2 + NO reaction system. International Journal of Chemical Kinetics, 37, 522-531, 2005 J. D. Raff, P. S. Stevens, and R. A. Hites. Relative Rate and Product Studies of the OH-Acetone Reaction. Journal of Physical Chemistry A, 109, 4728-4735, 2005 W. Lee, M. Baasandorj, P. S. Stevens, and R. A. Hites. Monitoring the OH-Initiated Oxidation Kinetics of Isoprene and its Products using On-line Mass Spectrometry. Environmental Science and Technology, 39, 1030-1036, 2005 M. E. Davis and P. S. Stevens. Measurements of the kinetics of the OH-initiated oxidation of a-pinene: Radical propagation in the OH + a-pinene + O2 + NO reaction system. Atmospheric Environment, 39, 1765-1774, 2005 B. Chuong and P. S. Stevens. Measurements of the kinetics of the OH-initiated oxidation of methy vinyl ketone and methacrolein. International Journal of Chemical Kinetics, 36, 12-25, 2004 W. Lee, P. S. Stevens, and R. A. Hites. Rate constants for the gas-phase reactions of methylphenanthrenes with OH as a function of temperature. Journal of Physical Chemistry A, 107, 6603-6608, 2003 B. Chuong and P. S. Stevens. Kinetics of the OH + methyl vinyl ketone and OH + methacrolein reactions at low pressure. Journal of Physical Chemistry A, 107, 2185-2191, 2003 B. Chuong and P. S. Stevens. Measurements of the kinetics of the OH-initiated oxidation of isoprene. Journal of Geophysical Research, 107, D13, 4162, doi:10.1029/2001JD000865, 2002 B. Chuong, M. Davis, M. Edwards, and P. S. Stevens. Measurements of the kinetics of the OH + a-pinene and OH + b-pinene reactions at low pressure. International Journal of Chemical Kinetics, 34, 300-308, 2002 P. S. Stevens, E. Seymour, and Z. Li. Theoretical and experimental studies of the reaction of OH with isoprene. Journal of Physical Chemistry A, 104, 5989-5997, 2000 B. Chuong and P. S. Stevens. Kinetic study of the OH + isoprene and OH + ethylene reactions between 2 ‑ 6 Torr and over the temperature range 300 ‑ 423 K. Journal of Physical Chemistry A, 104, 5230-5237, 2000

P. Stevens, D. L’Esperance, B. Chuong, and G. Martin. Measurements of the kinetics of the OH-initiated oxidation of isoprene: Radical propagation in the OH + Isoprene + O2 + NO Reaction System. International Journal of Chemical Kinetics, 31, 637-643, 1999