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We investigated the collection efficiency and effective ionization efficiencyfor secondary organic aerosol (SOA) particles made from α-pinene +O3 using the single-particle capabilities of the aerosol massspectrometer (AMS). The mean count-based collection efficiency (CEp) forSOA across these experiments is 0.30 (±0.04 SD), ranging from 0.25 to0.40. The mean mass-based collection efficiency (CEm) is0.49 (±0.07 SD). This sub-unit collection efficiency and delayedvaporization is attributable to particle bounce in the vaporization region.Using the coupled optical and chemical detection of the light-scatteringsingle-particle (LSSP) module of the AMS, we provide clear evidence that<q>delayed vaporization</q> is somewhat of a misnomer for these particles: SOAparticles measured as a part of the AMS mass distribution do not vaporizeat a slow rate; rather, they flash-vaporize, albeit often not on the initialimpact with the vaporizer but instead upon a subsequent impact with a hotsurface in the vaporization region. We also find that the effectiveionization efficiency (defined as ions per particle, IPP) decreases withdelayed arrival time. CEp is not a function of particlesize (for the mobility diameter range investigated, 170–460 nm), but we didsee a decrease in CEp with thermodenuder temperature,implying that oxidation state and/or volatility can affect CEp for SOA. By measuring the mean ions per particle produced formonodisperse particles as a function of signal delay time, we can separatelydetermine CEp and CEm and thus moreaccurately measure the relative ionization efficiency (compared to ammoniumnitrate) of different particle types

atmospheric measurement techniques

Collection efficiency of &amp;lt;i&amp;gt;α&amp;lt;/i&amp;gt;-pinene secondary organic aerosol particles explored via light-scattering single-particle aerosol mass spectrometry