Journal
AEROSOL SCIENCE AND TECHNOLOGY
Volume 43, Issue 10, Pages 1006-1012Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/02786820903117932
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Funding
- Department of Energy [DE-FG02-05ER63995]
- National Science Foundation [ATM-0525355]
- NASA
- Directorate For Geosciences [0904292] Funding Source: National Science Foundation
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A photo-acoustic absorption spectrometer (PAS) and a cavity ring down aerosol extinction spectrometer (CRD-AES) were used, in conjunction with Mie Theory, to measure the refractive index (RI) of absorbing polystyrene spheres (APSS). The PAS and CRD-AES were also used to measure the absorption and extinction enhancement after these APSS were coated in oleic acid. The experimental enhancements were then compared to predictions from coated-sphere Mie Theory. The measured absorption and extinction enhancements both agreed with modeled enhancements to within an average of 5%. A filter-based absorption technique (particle soot absorption photometer, PSAP) was also used to measure the absorption by the APSS and showed a significant size-dependent bias, as evidenced by the filter-based method measuring significantly lower absorption for both uncoated and coated APSS compared to the PAS. These results suggest the validity of applying photo-acoustics to measure the absorption enhancement created by semi-volatile atmospheric species coating absorbing particles.
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