Erschienen:
American Association for the Advancement of Science (AAAS), 2005
Erschienen in:
Science, 307 (2005) 5710, Seite 698-700
Sprache:
Englisch
DOI:
10.1126/science.1104054
ISSN:
0036-8075;
1095-9203
Entstehung:
Anmerkungen:
Beschreibung:
We investigated the formation of new particles in a laboratory study, starting from H 2 SO 4 produced in situ through the reaction of OH radicals with SO 2 . Newly formed particles were observed for H 2 SO 4 concentrations above 7 × 10 6 per cubic centimeter. At 293 kelvin, a rough estimate yielded a nucleation rate of 0.3 to 0.4 particles per cubic centimeter per second for ∼10 7 particles per cubic centimeter of H 2 SO 4 (particle size ≥ 3 nanometers). These findings are in agreement with observations from the atmosphere. The results demonstrate that under laboratory conditions similar to the atmosphere, particle formation occurs at atmospheric H 2 SO 4 concentration levels.