{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,2]],"date-time":"2026-05-02T03:53:56Z","timestamp":1777694036770,"version":"3.51.4"},"reference-count":42,"publisher":"Proceedings of the National Academy of Sciences","issue":"43","content-domain":{"domain":["www.pnas.org"],"crossmark-restriction":true},"short-container-title":["Proc. Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2013,10,22]]},"abstract":"<jats:title>Significance<\/jats:title>\n          <jats:p>The formation of nanoparticles by condensable vapors in the atmosphere influences radiative forcing and therefore climate. We explored the detailed mechanism of particle formation, in particular the role of oxidized organic molecules that arise from the oxidation of monoterpenes, a class of volatile organic compounds emitted from plants. We mimicked atmospheric conditions in a well-controlled laboratory setup and found that these oxidized organics form initial clusters directly with single sulfuric acid molecules. The clusters then grow by the further addition of both sulfuric acid and organic molecules. Some of the organics are remarkably highly oxidized, a critical feature that enables them to participate in forming initial stable molecular clusters and to facilitate the first steps of atmospheric nanoparticle formation.<\/jats:p>","DOI":"10.1073\/pnas.1306973110","type":"journal-article","created":{"date-parts":[[2013,10,8]],"date-time":"2013-10-08T03:17:51Z","timestamp":1381202271000},"page":"17223-17228","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":325,"title":["Molecular understanding of atmospheric particle formation from sulfuric acid and large oxidized organic molecules"],"prefix":"10.1073","volume":"110","author":[{"given":"Siegfried","family":"Schobesberger","sequence":"first","affiliation":[{"name":"Department of Physics, University of Helsinki, 00014 Helsinki, Finland;"}]},{"given":"Heikki","family":"Junninen","sequence":"additional","affiliation":[{"name":"Department of Physics, University of Helsinki, 00014 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