Peer-Reviewed Journal Details
Mandatory Fields
O'Dowd, CD,Aalto, PP,Yoon, YJ,Hameri, K
2004
February
Journal Of Aerosol Science
The use of the pulse height analyser ultrafine condensation particle counter (PHA-UCPC) technique applied to sizing of nucleation mode particles of differing chemical composition
Published
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Optional Fields
BIOGENIC IODINE EMISSIONS NUCLEUS COUNTER ATMOSPHERIC PARTICLES AEROSOL-PARTICLES BOUNDARY-LAYER BOREAL FOREST MOBILITY GROWTH BURSTS RATES
35
205
216
A modified white-light pulse-height analyser (PHA) TSI 3025 ultra-fine condensation particle counter (UCPC) is often used to provide fast response of aerosol size distributions between 3 and 10 nm since there is a monotonic link between initial aerosol size and nucleated droplet final size. The use of the PHA-UCPC for sizing nucleation mode particles depends on the droplet nucleation in the condenser chamber being somewhat independent of particle composition. Laboratory characterization of the PHA-UCPC for a range of chemical compositions, thought to be involved in atmospheric aerosol nucleation and growth, are presented here. Ammonium sulphate, pinic acid, cis-pinonic acid, malonic acid and an iodine oxide were studied and their PHA-UCPC calibration kernels are presented. It was found that all species possessed significantly different PHA responses. The results suggest that, unless the nano-particle chemical composition is known, then the PHA-UCPC cannot be used for measurements of aerosol size distributions. However, the PHA-UCPC, if used in parallel with mobility size distribution measurements, can help elucidate nano-particle chemical composition. Using the combination of mobility size distributions and the PHA-UCPC response during a nucleation and growth event over the boreal forest indicates that new particle formation, in this region, is driven by condensation of organic vapours. (C) 2003 Elsevier Ltd. All rights reserved.
DOI 10.1016/j.jaerosci.2003.08.003
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