Instruments

Scientists Fred Eisele, Jim Smith,  and Katharine Moore with TDCIMS

Early Days ... Fred Eisele, Jim Smith, and Katharine Moore with the first protoype Thermal Desorption Chemical Ionization Mass Spectrometer (TDCIMS), circa 2003 (note the vice-grip holding the instrument together!).

The properties of ultrafine aerosols:

We study the properties of ultrafine aerosol (< 100 nm), in particular their chemical composition, using the Thermal Desorption Chemical Ionization Mass Spectrometer, or TDCIMS. The Cluster Chemical Ionization Ion Trap Mass Spectrometer (Cluster CIMS) is a new development effort towards building a lightweight, portable instrument for characterizing the gas phase precursors for particle formation and growth. Both the TDCIMS and the Cluster CIMS are ground-based instruments.

The impacts of ultrafine aerosols:

We study the impacts of ultrafine aerosols using a Hygroscopicity Tandem Differential Mobility Analyzer (HTDMA), which exposes size-selected particles to high humidity (90% relative humidity) to investigate how readily particles can take on water. We also employ a Cloud Condensation Nucleus counter (CCNc), which counts the number of particles that are capable of forming cloud droplets.

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ACOM | Atmospheric Chemistry Observations & Modeling