Physics
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3303816o&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 3, CiteID L03816
Physics
32
Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Instruments And Techniques
Scientific paper
Volume concentrations of steady-state secondary organic aerosol (SOA) were measured in several hydrocarbon/NOx irradiation experiments after passing through a constant temperature heated tube. Higher temperatures resulted in greater loss of particle volume. Negatives of the measured effective enthalpies of vaporization (ΔHvap,eff25-300) for SOA range from 11 to 44 kJ mol-1, and depend upon the reactant hydrocarbon (α-pinene, toluene, or 1,3,5-trimethylbenzene). Significant negative correlations between ΔHvap,eff25-300 and [NOx] are observed for SOA formed from α-pinene or toluene. The ΔHvap,eff25-300 of SOA formed in the photooxidation of toluene is similar to that generated by the nebulization of glyoxal, indicating that the oligomers formed by nebulizing glyoxal may represent a surrogate for the chemical mixture formed in toluene photooxidation. These laboratory measurements suggest that the thermodynamic behavior of SOA depends upon the reactant hydrocarbon mixture and NOx concentration.
Edney Edward O.
Jaoui Mohammed
Kleindienst Tadeusz E.
Lewandowski Michael
Offenberg John H.
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