Journal
AEROSOL SCIENCE AND TECHNOLOGY
Volume 41, Issue 4, Pages 343-359Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/02786820701199736
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Funding
- NERC [ncas10006] Funding Source: UKRI
- Natural Environment Research Council [ncas10006] Funding Source: researchfish
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A light scattering module has been integrated into the current AMS instrument. This module provides the simultaneous measurement of vacuum aerodynamic diameter (d(va)) and scattered light intensity (R-LS) for all particles sampled by the AMS above similar to 180 nm geometric diameter. Particle counting statistics and correlated chemical ion signal intensities are obtained for every particle that scatters light. A single calibration curve converts RLS to an optical diameter (d(o)). Using the relationship between d(va) and d(o) the LS-AMS provides a real-time, per particle measurement of the density of the sampled aerosol particles. The current article is focused on LS-AMS measurements of spherical, non-absorbing aerosol particles. The laboratory characterization of LS-AMS shows that a single calibration curve yields the material density of spherical particles with real refractive indices (n) over a range from 1.41 < n < 1.60 with an accuracy of about +/- 10%. The density resolution of the current LS-AMS system is also shown to be 10% indicating that externally mixed inorganic/organic aerosol distributions can be resolved. In addition to the single particle measurements of d(va) and R-LS, correlated chemical ion signal intensities are obtained with the quadrupole mass spectrometer. A comparison of the particle mass derived from the physical (R-LS and d(va)) and chemical measurements provides a consistency check on the performance of the LS-AMS. The ability of the LS-AMS instrument to measure the density of ambient aerosol particles is demonstrated with sample results obtained during the Northeast Air Quality Study (NEAQS) in the summer of 2004.
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