title: Secondary organic aerosols from anthropogenic and biogenic precursors.
abstract: Secondary organic aerosol (SOA) formation from the photooxidation of an anthropogenic (1,3,5-trimethylbenzene) and a biogenic (alpha-pinene) precursor was investigated at the new PSI smog chamber. The chemistry of the gas phase was followed by proton transfer reaction mass spectrometry, while the aerosol chemistry was investigated with aerosol mass spectrometry, ion chromatography, laser desorption ionization mass spectrometry, and infrared spectroscopy, along with volatility and hygroscopicity studies. Evidence for oligomer formation for SOA from both precursors was given by an increasing abundance of compounds with a high molecular weight (up to 1000 Da) and by an increasing thermal stability with increasing aging time. The results were compared to data obtained from ambient aerosol samples, revealing a number of similar features.
authors.affiliation: Laboratory of Atmospheric Chemistry, Paul Scherrer Institut, 5232, Villigen, Switzerland.
authors.forename: U
authors.initials: U
authors.lastname: Baltensperger
authors.forename: M
authors.initials: M
authors.lastname: Kalberer
authors.forename: J
authors.initials: J
authors.lastname: Dommen
authors.forename: D
authors.initials: D
authors.lastname: Paulsen
authors.forename: M R
authors.initials: MR
authors.lastname: Alfarra
authors.forename: H
authors.initials: H
authors.lastname: Coe
authors.forename: R
authors.initials: R
authors.lastname: Fisseha
authors.forename: A
authors.initials: A
authors.lastname: Gascho
authors.forename: M
authors.initials: M
authors.lastname: Gysel
authors.forename: S
authors.initials: S
authors.lastname: Nyeki
authors.forename: M
authors.initials: M
authors.lastname: Sax
authors.forename: M
authors.initials: M
authors.lastname: Steinbacher
authors.forename: A S H
authors.initials: AS
authors.lastname: Prevot
authors.forename: S
authors.initials: S
authors.lastname: Sjögren
authors.forename: E
authors.initials: E
authors.lastname: Weingartner
authors.forename: R
authors.initials: R
authors.lastname: Zenobi
mesh_terms: D000336:Aerosols / Q000032:analysis* / Q000737:chemistry; D000393:Air Pollutants / Q000032:analysis / Q000737:chemistry; D001555:Benzene Derivatives / Q000032:analysis*; D000081008:Bicyclic Monoterpenes; D002852:Chromatography, Ion Exchange; D008970:Molecular Weight; D039821:Monoterpenes / Q000032:analysis*; D010083:Oxidants, Photochemical / Q000737:chemistry*; D010126:Ozone / Q000032:analysis* / Q000737:chemistry; D013057:Spectrum Analysis; D013696:Temperature
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D001555:Benzene Derivatives; D000081008:Bicyclic Monoterpenes; D039821:Monoterpenes; D010083:Oxidants, Photochemical; D010126:Ozone; C005451:alpha-pinene