Laboratory evaluation of species-dependent relative ionization efficiencies in the Aerodyne Aerosol Mass Spectrometer

Wen Xu, Andrew Lambe, Philip Silva, Weiwei Hu, Timothy Onasch, Leah Williams, Philip Croteau, Xuan Zhang, Lindsay Renbaum-Wolff, Edward Fortner, Jose L. Jimenez, John Jayne, Douglas Worsnop & Manjula Canagaratna
Mass concentrations calculated from Aerodyne's aerosol mass spectrometers depend on particle collection efficiency (CE) and relative ionization efficiency (RIE, relative to the primary calibrant ammonium nitrate). We present new laboratory RIE measurements for a wide range of organic aerosol species (RIEOA). An improved laboratory RIE calibration protocol with size and mass selection of calibrant particles and a light scattering-based detection of CE is used. Simpler calibrations of alcohol RIEs using binary mixtures with NH4NO3 are...
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