Laboratory Kinetics

Members:

Geoff Tyndall (project lead): tyndall@ucar.edu
John Orlando:    orlando@ucar.edu

General Scientific Objectives:

  • Understand the oxidation mechanisms of organic compounds in the atmosphere.
  • Study the reactions and cycling of atmospheric free radicals (HOx, NOx and halogens).


Available Research Tools:

  • Stainless steel environmental chamber, 50 L volume, temperature-regulated, interfaced to an FTIR spectrometer and GC-FID system (for mechanistic studies and relative rate coefficient determinations).
  • Teflon chamber, 10 cubic meters, for atmospheric organic mechanism studies.  In addition to basic chamber characterization and control instrumentation (flow rates, ozone, temperature, particle size distribution, relative humidity, pressure, and light control), gas-chromatography (GC), proton-transfer reaction – mass spectrometry, and chemical ionization mass spectrometers (CIMS) are available for chemical characterization of chamber contents.
  • UV/visible absorption spectrometer system.
  • Flash photolysis system – Pulsed excimer laser; near-IR diode laser absorption system for time-resolved detection and kinetic studies.


Major Current Research Foci:

  • Oxidation mechanisms for isoprene and other biogenic compounds (including influence of this chemistry on plant-insect interactions).
  • Oxidation mechanisms of multifunctional organic compounds.
  • Reactions of organic peroxy radicals (e.g., reactions with HO2, unimolecular processes).
  • Reactions of Br-atoms with organics.
  • Reactions of NO3 radicals with unsaturated species.
  • Reaction mechanism development; structure-reactivity relationships.
  • Impact of VOC emissions from wildfires on air quality and climate.


Current Collaborators:

  • Dr. Alam Hasson and his group, Fresno State University
  • Dr. José Fuentes, Penn State University
  • Dr. Carla Kegley-Owen, University of Nebraska-Kearney
  • Dr. Rainer Volkamer, University of Colorado
  • Dr. Max McGillen, NOAA ESRL / CIRES
  • Dr. Sergey Nizkorodov, Univ. California at Irvine
  • Dr. Bob Yokelson, Univ. of Montana
  • Dr. Paul Wennberg, Cal Tech
  • Dr. Kelley Barsanti, UC-Riverside


Contact us at the email addresses above if you would like to discuss a collaborative project!

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ACOM | Atmospheric Chemistry Observations & Modeling