imprint:
American Association for the Advancement of Science (AAAS), 2005
Published in:Science
Language:
English
DOI:
10.1126/science.1104054
ISSN:
0036-8075;
1095-9203
Origination:
Footnote:
Description:
<jats:p>
We investigated the formation of new particles in a laboratory study, starting from H
<jats:sub>2</jats:sub>
SO
<jats:sub>4</jats:sub>
produced in situ through the reaction of OH radicals with SO
<jats:sub>2</jats:sub>
. Newly formed particles were observed for H
<jats:sub>2</jats:sub>
SO
<jats:sub>4</jats:sub>
concentrations above 7 × 10
<jats:sup>6</jats:sup>
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
<jats:sup>7</jats:sup>
particles per cubic centimeter of H
<jats:sub>2</jats:sub>
SO
<jats:sub>4</jats:sub>
(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
<jats:sub>2</jats:sub>
SO
<jats:sub>4</jats:sub>
concentration levels.
</jats:p>