Laboratory observation of oligomers in the aerosol from isoprene/NOₓ photooxidation

Compounds assigned to be oxidation products of isoprene (2-methyl-1,3-butadiene) have recently been observed in ambient aerosols, suggesting that isoprene might play an important role in secondary organic aerosol (SOA) formation due to its large global source strength. SOA yields from photooxidation of isoprene and NOₓ in a chamber agree fairly well with previous data. Matrix assisted laser desorption/ionization mass spectrometry showed the formation of high molecular weight compounds over the course of 15-hour experiments. Concurrently, the volatility of the SOA decreased markedly as observed by a tandem differential mobility analyzer. The volume fraction remaining of SOA at 150°C increased steadily from 5 to 25% during the same experiments. These observations are attributed to oligomerization reactions occurring in the aerosol phase. Under dry conditions a lower volatility was observed.

Schlagwörter

Fachgebiet (DDC)

550 - Geowissenschaften

Projekt

Veranstaltung

Startdatum der Ausstellung

Enddatum der Ausstellung

Startdatum der Konferenz

Enddatum der Konferenz

Datum der letzten Prüfung

ISBN

ISSN

0094-8276
1944-8007

Sprache

Englisch

Während FHNW Zugehörigkeit erstellt

Nein

Zukunftsfelder FHNW

Publikationsstatus

Veröffentlicht

Begutachtung

Peer-Review der ganzen Publikation

Open Access-Status

Closed

Lizenz

Zitation

DOMMEN, Josef, Axel METZGER, Jonathan DUPLISSY, Markus KALBERER, M. Rami ALFARRA, Astrid GASCHO, Ernest WEINGARTNER, André S.H. PRÉVÔT, Bart VERHEGGEN und Urs BALTENSPERGER, 2006. Laboratory observation of oligomers in the aerosol from isoprene/NOₓ photooxidation. Geophysical Research Letters. 2006. Bd. 33, Nr. 13. DOI 10.1029/2006gl026523. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46726

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