The Model 3800 Aerosol Time-of-Flight Mass Spectrometer (ATOFMS) measures single particle size and chemical composition in the range from 0.3 to 3 micrometers (up to 10 micrometers with optional disperser). It uses an aerodynamic sizing technique to size individual particles in real time. Then, it desorbs and ionizes the particle for chemical analysis in a bipolar, time-of-flight mass spectrometer. The instrument is capable of saving positive and negative mass spectra at a rate of up to 10 particles per second.
