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| Titel |
Homogenous nucleation of sulfuric acid and water at close to atmospherically relevant conditions |
| VerfasserIn |
D. Brus, K. Neitola, A.-P. Hyvärinen, T. Petäjä, J. Vanhanen, M. Sipilä, P. Paasonen, M. Kulmala  , H. Lihavainen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 11 ; Nr. 11, no. 11 (2011-06-06), S.5277-5287 |
| Datensatznummer |
250009802
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| Publikation (Nr.) |
 copernicus.org/acp-11-5277-2011.pdf |
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| Zusammenfassung |
| In this study the homogeneous nucleation rates in the system of sulfuric
acid and water were measured by using a flow tube technique. The goal was to
directly compare particle formation rates obtained from atmospheric
measurements with nucleation rates of freshly nucleated particles measured
with particle size magnifier (PSM) which has detection efficiency of unity
for particles having mobility diameter of 1.5 nm. The gas phase sulfuric
acid concentration in this study was measured with the chemical ionization
mass spectrometer (CIMS), commonly used in field measurements. The wall
losses of sulfuric acid were estimated from measured concentration profiles
along the flow tube. The initial concentrations of sulfuric acid estimated
from loss measurements ranged from 108 to 3 × 109 molecules cm−3. The nucleation rates obtained in this study cover about three
orders of magnitude from 10−1 to 102 cm−3 s−1 for
commercial ultrafine condensation particle counter (UCPC) TSI model 3025A
and from 101 to 104 cm−3 s−1 for PSM. The nucleation
rates and the slopes (dlnJ/dln [H2SO4]) show satisfactory agreement
when compared to empirical kinetic and activation models and the latest
atmospheric nucleation data. To the best of our knowledge, this is the first
experimental work providing temperature dependent nucleation rate
measurements using a high efficiency particle counter with a cut-off-size of
1.5 nm together with direct measurements of gas phase sulfuric acid
concentration. |
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