Atmospheric Measurement Techniques
www.atmos-meas-tech.net
1867-1381
1867-8548
3
4
2010
10.5194/amt-3-1175-2010
http://www.atmos-meas-tech.net/3/1175/2010/
http://www.atmos-meas-tech.net/3/1175/2010/amt-3-1175-2010.html
http://www.atmos-meas-tech.net/3/1175/2010/amt-3-1175-2010.pdf
1175
1183
2010-08-31
Near-infrared laser desorption/ionization aerosol mass spectrometry for measuring organic aerosol at atmospherically relevant aerosol mass loadings
S. Geddes
B. Nichols
K. Todd
J. Zahardis
G. A. Petrucci
giuseppe.petrucci@uvm.edu
Department of Chemistry, University of Vermont, Burlington, VT 05405 USA
A new method, near-infrared laser desorption/ionization
aerosol mass spectrometry (NIR-LDI-AMS), is described for the real time
analysis of organic aerosols at atmospherically relevant total mass
loadings. Particles are sampled with an aerodynamic lens onto an aluminum
probe. A moderate energy NIR laser pulse at 1064 nm is directed onto the
probe to vaporize and ionize particle components. Delayed pulse extraction
is then used to sample the ions into a reflectron time of flight mass
spectrometer for chemical analysis. The soft ionization afforded by the NIR
photons results in minimal fragmentation (loss of a hydrogen atom) producing
intact pseudo-molecular anions at [M-H]<sup>−</sup>. The limit of detection
measured for pure oleic acid particles (geometric mean diameter and standard
deviation of 180 nm and 1.3, respectively) was 140 fg (or 1.7 ng m<sup>−3</sup> per
minute sampling time). As an example of the utility of NIR-LDI-AMS to
measurements of atmospheric importance, the method was applied to laboratory
chamber measurements of the secondary organic aerosol formation from
ozonolysis of α-pinene. High quality mass spectra were recorded with a 2-min
time resolution for total aerosol mass loadings ranging from 1.5 to
8.7 μg m<sup>−3</sup>. These results demonstrate the potential of NIR-LDI-AMS to allow
for more accurate measurements of the organic fraction of atmospheric
particulate at realistic mass loadings. Measurements at ambient-levels of
SOA mass loading are important to improve parameterizations of chamber-based
SOA formation for modeling regional and global SOA fluxes and to aid in
remediating the discrepancy between modeled and observed atmospheric total
SOA production rates and concentrations.
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