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. A new method for size-resolved chemical analysis of nucleationmode aerosol particles (size range from ∼10 to ∼30  nm) is presented. The Thermal Desorption Differential Mobility Analyzer(TD-DMA) uses an online, discontinuous principle. The particles are charged,a specific size is selected by differential mobility analysis and they arecollected on a filament by electrostatic precipitation. Subsequently, thesampled mass is evaporated in a clean carrier gas and analyzed by a chemicalionization mass spectrometer. Gas-phase measurements are performed with thesame mass spectrometer during the sampling of particles. The characterizationshows reproducible results, with a particle size resolution of 1.19 and thetransmission efficiency for 15 nm particles being slightly above 50 %. Thesignal from the evaporation of a test substance can be detected starting from0.01 ng and shows a linear response in the mass spectrometer. Instrumentoperation in the range of pg m −3 is demonstrated by an examplemeasurement of 15 nm particles produced by nucleation from dimethylamine,sulfuric acid and water.

atmospheric measurement techniques

Size-resolved online chemical analysis of nanoaerosol particles: a thermal desorption differential mobility analyzer coupled to a chemical ionization time-of-flight mass spectrometer