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Professor Kimberly Prather and research group University of California, San Diego

Professor Kimberly Prather and research group University of California, San Diego. Instrument Measures Aerosol time-of-flight Individual particle size and composition mass spectrometers (4) Scanning mobility particle size (20 nm to 0.6 um) particle sizing systems (2)

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Professor Kimberly Prather and research group University of California, San Diego

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  1. Professor Kimberly Prather and research group University of California, San Diego

  2. InstrumentMeasures Aerosol time-of-flight Individual particle size and composition mass spectrometers (4) Scanning mobility particle size (20 nm to 0.6 um) particle sizing systems (2) Ultrafine aerosol mass spectrometer The composition of size selected particles down to 50 nm Aerodynamic particle sizing systems (3) Aerodynamic particle size (0.5 um to 10 um) Opticle particle counters (2) Opticle particle size (0.2 um to 10 um) Nephelometers Light backscattering (visibility) Flow tubes Used for measuring particle formation processes and heterogeneous chemistry on short time scales Smog chamber system Used for measuring particle formation, growth, and chemistry of particles under controlled conditions of relative humidity and UV flux Atmospheric Pressure Chemical Ionization Extremely sensitive technique for measuring Mass Spectrometer gas phase species concentrations Meteorological stations (3) Temperature, wind speed and direction, relative humidity NOx system Gas phase concentrations of NOx Ozone monitor Gas phase concentrations of ozone SOx system Gas phase concentrations of SOx HPLC system Used for separation and detection of complex mixtures GC system Used for separation and detection of complex mixtures MOUDI impactors Size segregated particle mass concentrations Tapered element oscillating PM2.5 and PM10 mass concentration microbalance (TEOM) Nd:YAG laser systems (nanosecond) (6) Used for LDI at 266 nm (also 1064, 532, and 355 nm available) CO2 laser system Used in 2-step LDI-TOFMS **Femtosecond IR laser (coming in Jan. 2002!!) Used for LDI in IR region In addition to the instruments above which are housed in our labs, we have access to a host of other analytical instruments including electron microscopy (particle shape), UV-Vis, Raman, and IR spectrometers, AtomicForce Imaging instruments, surface analysis instruments, and a wide range of mass spectrometers.

  3. I.e., 1 COH unit: log(I0/I)400=0.01

  4. PM = Particulate Matter -2 -2

  5. * Benzo(a)pyrene *“Bay region”

  6. • Nuclei mode • Accumulation mode • Coarse particle mode

  7. Bailey, Clark, Ferris, Krause and Strong, “Chemistry of the Environment,” second edition (San Diego: Academic Press) 2002.

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