{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,7]],"date-time":"2026-03-07T00:10:49Z","timestamp":1772842249114,"version":"3.50.1"},"reference-count":41,"publisher":"Proceedings of the National Academy of Sciences","issue":"42","content-domain":{"domain":["www.pnas.org"],"crossmark-restriction":true},"short-container-title":["Proc. Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2014,10,21]]},"abstract":"<jats:title>Significance<\/jats:title>\n          <jats:p>A significant fraction of atmospheric aerosols is formed from the condensation of low-volatility vapors. These newly formed particles can grow, become seeds for cloud particles, and influence climate. New particle formation in the planetary boundary layer generally proceeds via the neutral channel. However, unambiguous identification of neutral nucleating clusters has so far not been possible under atmospherically relevant conditions. We explored the system of sulfuric acid, water, and dimethylamine in a well-controlled laboratory experiment and measured the time-resolved concentrations of neutral clusters. Clusters containing up to 14 sulfuric acid and 16 dimethylamine molecules were observed. Our results demonstrate that a cluster containing as few as two sulfuric acid and one or two dimethylamine molecules is already stable against evaporation.<\/jats:p>","DOI":"10.1073\/pnas.1404853111","type":"journal-article","created":{"date-parts":[[2014,10,7]],"date-time":"2014-10-07T02:54:30Z","timestamp":1412650470000},"page":"15019-15024","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":224,"title":["Neutral molecular cluster formation of sulfuric acid\u2013dimethylamine observed in real time under atmospheric conditions"],"prefix":"10.1073","volume":"111","author":[{"given":"Andreas","family":"K\u00fcrten","sequence":"first","affiliation":[{"name":"Institute for Atmospheric and Environmental Sciences, Goethe-University of Frankfurt, 60438 Frankfurt am Main, Germany;"}]},{"given":"Tuija","family":"Jokinen","sequence":"additional","affiliation":[{"name":"Department of Physics, University of Helsinki, 00014 Helsinki, 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