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We present the first single particle results obtained with an Aerodynetime-of-flight aerosol mass spectrometer coupled with a light scatteringmodule (LS-ToF-AMS). The instrument was deployed at the T1 ground siteapproximately 40 km northeast of the Mexico City Metropolitan Area as partof the MILAGRO field study in March of 2006. The LS-ToF-AMS acquires bothensemble average and single particle data. Over a 75-h sampling periodfrom 27–30 March 2006, 12 853 single particle mass spectra wereoptically-triggered and saved. The single particles were classified based onobserved vaporization histories and measured chemical compositions. Thesingle particle data is shown to provide insights on internal AMS collectionefficiencies and ambient mixing state information that augments the ensembledata.  Detection of correlated light scattering and chemical ion signals allowedfor a detailed examination of the vaporization/ionization process for singleparticles measured with the AMS instrument. Three particle vaporizationevent types were identified as a fraction of the total number of particlesdetected: (1) 23% with prompt vaporization, (2) 26% with delayedvaporization, and (3) 51% characterized as null. Internal consistencychecks show that average single particle nonrefractory mass and chemicalcomposition measurements were in reasonable agreement with ensemblemeasurements and suggest that delayed and null vaporization events are thedominant source of the nonunit collection efficiency of the AMS. Takentogether, the simultaneous prompt single particle and aerosol ensemblemeasurements offer insight into the mixing state and atmospherictransformations of ambient aerosol particles

Single particle characterization using a light scattering module coupled to a time-of-flight aerosol mass spectrometer