{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,19]],"date-time":"2026-04-19T03:22:44Z","timestamp":1776568964306,"version":"3.51.2"},"reference-count":50,"publisher":"Copernicus GmbH","issue":"20","license":[{"start":{"date-parts":[[2020,10,20]],"date-time":"2020-10-20T00:00:00Z","timestamp":1603152000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002341","name":"Research Council of Finland","doi-asserted-by":"publisher","award":["307331"],"award-info":[{"award-number":["307331"]}],"id":[{"id":"10.13039\/501100002341","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002341","name":"Research Council of Finland","doi-asserted-by":"publisher","award":["299574"],"award-info":[{"award-number":["299574"]}],"id":[{"id":"10.13039\/501100002341","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002341","name":"Research Council of Finland","doi-asserted-by":"publisher","award":["296628"],"award-info":[{"award-number":["296628"]}],"id":[{"id":"10.13039\/501100002341","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002341","name":"Research Council of Finland","doi-asserted-by":"publisher","award":["306853"],"award-info":[{"award-number":["306853"]}],"id":[{"id":"10.13039\/501100002341","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002341","name":"Research Council of Finland","doi-asserted-by":"publisher","award":["304013"],"award-info":[{"award-number":["304013"]}],"id":[{"id":"10.13039\/501100002341","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002428","name":"Austrian Science Fund","doi-asserted-by":"publisher","award":["J3951-N36"],"award-info":[{"award-number":["J3951-N36"]}],"id":[{"id":"10.13039\/501100002428","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002428","name":"Austrian Science Fund","doi-asserted-by":"publisher","award":["P27295-N20"],"award-info":[{"award-number":["P27295-N20"]}],"id":[{"id":"10.13039\/501100002428","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004359","name":"Vetenskapsr\u00e5det","doi-asserted-by":"publisher","award":["2011-5120"],"award-info":[{"award-number":["2011-5120"]}],"id":[{"id":"10.13039\/501100004359","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Atmos. Chem. Phys."],"abstract":"<jats:p>Abstract. Nucleation of atmospheric vapours produces more than half of global cloud\ncondensation nuclei and so has an important influence on climate. Recent\nstudies show that monoterpene (C10H16) oxidation yields\nhighly oxygenated products that can nucleate with or without sulfuric acid.\nMonoterpenes are emitted mainly by trees, frequently together with isoprene\n(C5H8), which has the highest global emission of all organic\nvapours. Previous studies have shown that isoprene suppresses new-particle\nformation from monoterpenes, but the cause of this suppression is under\ndebate. Here, in experiments performed under atmospheric conditions in the\nCERN CLOUD chamber, we show that isoprene reduces the yield of\nhighly oxygenated dimers with 19 or 20 carbon atoms \u2013 which drive particle\nnucleation and early growth \u2013 while increasing the production of dimers with\n14 or 15 carbon atoms. The dimers (termed C20 and C15,\nrespectively) are produced by termination reactions between pairs of peroxy\nradicals (RO2\u26ab) arising from monoterpenes or isoprene.\nCompared with pure monoterpene conditions, isoprene reduces nucleation rates\nat 1.7\u2009nm (depending on the isoprene\u2009\u2215\u2009monoterpene ratio) and approximately\nhalves particle growth rates between 1.3 and 3.2\u2009nm. However, above 3.2\u2009nm,\nC15 dimers contribute to secondary organic aerosol, and the growth rates\nare unaffected by isoprene. We further show that increased hydroxyl radical\n(OH\u26ab) reduces particle formation in our chemical system rather\nthan enhances it as previously proposed, since it increases isoprene-derived\nRO2\u26ab radicals that reduce C20 formation.\nRO2\u26ab termination emerges as the critical step that determines\nthe highly oxygenated organic molecule (HOM) distribution and the corresponding nucleation capability. Species\nthat reduce the C20 yield, such as NO, HO2 and as we show\nisoprene, can thus effectively reduce biogenic nucleation and early growth.\nTherefore the formation rate of organic aerosol in a particular region of\nthe atmosphere under study will vary according to the precise ambient\nconditions.<\/jats:p>","DOI":"10.5194\/acp-20-11809-2020","type":"journal-article","created":{"date-parts":[[2020,10,20]],"date-time":"2020-10-20T03:26:47Z","timestamp":1603164407000},"page":"11809-11821","source":"Crossref","is-referenced-by-count":83,"title":["Molecular understanding of the suppression of new-particle formation by isoprene"],"prefix":"10.5194","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9171-8127","authenticated-orcid":false,"given":"Martin","family":"Heinritzi","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1105-9043","authenticated-orcid":false,"given":"Lubna","family":"Dada","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4900-7460","authenticated-orcid":false,"given":"Mario","family":"Simon","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1014-1360","authenticated-orcid":false,"given":"Dominik","family":"Stolzenburg","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3159-9434","authenticated-orcid":false,"given":"Andrea C.","family":"Wagner","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3141-9088","authenticated-orcid":false,"given":"Lukas","family":"Fischer","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2534-6898","authenticated-orcid":false,"given":"Lauri R.","family":"Ahonen","sequence":"additional","affiliation":[]},{"given":"Stavros","family":"Amanatidis","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4480-2107","authenticated-orcid":false,"given":"Rima","family":"Baalbaki","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4614-247X","authenticated-orcid":false,"given":"Andrea","family":"Baccarini","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0014-3082","authenticated-orcid":false,"given":"Paulus 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K.,\nKupiainen-M\u00e4\u00e4tt\u00e4, O., Praplan, A. P., Adamov, A., Amorim, A.,\nBianchi, F., Breitenlechner, M., David, A., Dommen, J., Donahue, N. M.,\nDownard, A., Dunne, E., Duplissy, J., Ehrhart, S., Flagan, R. C., Franchin,\nA., Guida, R., Hakala, J., Hansel, A., Heinritzi, M., Henschel, H., Jokinen,\nT., Junninen, H., Kajos, M., Kangasluoma, J., Keskinen, H., Kupc, A.,\nKurt\u00e9n, T., Kvashin, A. N., Laaksonen, A., Lehtipalo, K., Leiminger, M.,\nLepp\u00e4, J., Loukonen, V., Makhmutov, V., Mathot, S., McGrath, M. J.,\nNieminen, T., Olenius, T., Onnela, A., Pet\u00e4j\u00e4, T., Riccobono, F.,\nRiipinen, I., Rissanen, M., Rondo, L., Ruuskanen, T., Santos, F. D.,\nSarnela, N., Schallhart, S., Schnitzhofer, R., Seinfeld, J. H., Simon, M.,\nSipil\u00e4, M., Stozhkov, Y., Stratmann, F., Tom\u00e9, A., Tr\u00f6stl, J.,\nTsagkogeorgas, G., Vaattovaara, P., Viisanen, Y., Virtanen, A., Vrtala, A.,\nWagner, P. E., Weingartner, E., Wex, H., Williamson, C., Wimmer, D., Ye, P.,\nYli-Juuti, T., Carslaw, K. S., Kulmala, M., Curtius, J., Baltensperger, U.,\nWorsnop, D. R., Vehkam\u00e4ki, H., and Kirkby, J.: Molecular understanding\nof sulphuric acid\u2013amine particle nucleation in the atmosphere, Nature, 502,\n359, https:\/\/doi.org\/10.1038\/nature12663, 2013.","DOI":"10.1038\/nature12663"},{"key":"ref2","doi-asserted-by":"crossref","unstructured":"Berndt, T., Herrmann, H., Sipil\u00e4, M., and Kulmala, M.: Highly Oxidized\nSecond-Generation Products from the Gas-Phase Reaction of OH Radicals with\nIsoprene, J. Phys. Chem. A, 120, 10150\u201310159,\nhttps:\/\/doi.org\/10.1021\/acs.jpca.6b10987, 2016.","DOI":"10.1021\/acs.jpca.6b10987"},{"key":"ref3","doi-asserted-by":"crossref","unstructured":"Berndt, T., Mentler, B., Scholz, W., Fischer, L., Herrmann, H., Kulmala, M.,\nand Hansel, A.: Accretion Product Formation from Ozonolysis and OH Radical\nReaction of \u03b1-Pinene: Mechanistic Insight and the Influence of\nIsoprene and Ethylene, Environ. Sci. Technol., 52, 11069\u201311077, 2018a.","DOI":"10.1021\/acs.est.8b02210"},{"key":"ref4","doi-asserted-by":"crossref","unstructured":"Berndt, T., Scholz, W., Mentler, B., Fischer, L., Herrmann, H., Kulmala, M.,\nand Hansel, A.: Accretion Product Formation from Self- and Cross-Reactions\nof RO2 Radicals in the Atmosphere, Angewandte Chemie International Edition,\n57, 3820\u20133824, https:\/\/doi.org\/10.1002\/anie.201710989, 2018b.","DOI":"10.1002\/anie.201710989"},{"key":"ref5","doi-asserted-by":"crossref","unstructured":"Breitenlechner, M., Fischer, L., Hainer, M., Heinritzi, M., Curtius, J., and\nHansel, A.: PTR3: An Instrument for Studying the Lifecycle of Reactive\nOrganic Carbon in the Atmosphere, Anal. Chem., 89, 5824\u20135831,\nhttps:\/\/doi.org\/10.1021\/acs.analchem.6b05110, 2017.","DOI":"10.1021\/acs.analchem.6b05110"},{"key":"ref6","doi-asserted-by":"crossref","unstructured":"Budisulistiorini, S. H., Canagaratna, M. R., Croteau, P. L., Marth, W. J.,\nBaumann, K., Edgerton, E. S., Shaw, S. L., Knipping, E. M., Worsnop, D. R.,\nand Jayne, J. T.: Real-time continuous characterization of secondary organic\naerosol derived from isoprene epoxydiols in downtown Atlanta, Georgia, using\nthe Aerodyne Aerosol Chemical Speciation Monitor, Environ. Sci.\nTechnol., 47, 5686\u20135694, 2013.","DOI":"10.1021\/es400023n"},{"key":"ref7","doi-asserted-by":"crossref","unstructured":"Carlton, A. G., Wiedinmyer, C., and Kroll, J. H.: A review of Secondary Organic Aerosol (SOA) formation from isoprene, Atmos. Chem. Phys., 9, 4987\u20135005, https:\/\/doi.org\/10.5194\/acp-9-4987-2009, 2009.","DOI":"10.5194\/acp-9-4987-2009"},{"key":"ref8","doi-asserted-by":"crossref","unstructured":"Dada, L., Paasonen, P., Nieminen, T., Buenrostro Mazon, S., Kontkanen, J., Per\u00e4kyl\u00e4, O., Lehtipalo, K., Hussein, T., Pet\u00e4j\u00e4, T., Kerminen, V.-M., B\u00e4ck, J., and Kulmala, M.: Long-term analysis of clear-sky new particle formation events and nonevents in Hyyti\u00e4l\u00e4, Atmos. Chem. Phys., 17, 6227\u20136241, https:\/\/doi.org\/10.5194\/acp-17-6227-2017, 2017.","DOI":"10.5194\/acp-17-6227-2017"},{"key":"ref9","doi-asserted-by":"crossref","unstructured":"Duplissy, J., Merikanto, J., Franchin, A., Tsagkogeorgas, G., Kangasluoma,\nJ., Wimmer, D., Vuollekoski, H., Schobesberger, S., Lehtipalo, K., Flagan,\nR. C., Brus, D., Donahue, N. M., Vehkam\u00e4ki, H., Almeida, J., Amorim, A.,\nBarmet, P., Bianchi, F., Breitenlechner, M., Dunne, E. 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