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

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), with an average RIEOA = 1.6 ± 0.5 that is consistent with most ambient OA except for hydrocarbon-like organic aerosol (HOA) and cooking organic aerosol (COA) where RIEOA = 2 to 7 were obtained. See full article here: