This paper presents the data of chemical composition of the particles from OH oxidation reaction of 1,3,5-trimethylbenzene (1,3,5-TMB). The particle-phase compositions are measured on-line by using a vacuum ultraviolet (VUV) photoionization aerosol mass spectrometer. The assignments of the major peaks of photoionization mass spectrum, as well as their molecular structures, are presented. The optimized structures of the reactants, intermediates and transition states involved in the reaction of the bicyclic peroxy radical with HO are shown. The reaction routes of the OH-initiated oxidation of the deuterated 1,3,5-TMB sample are also calculated and displayed for comparison. The data presented here is related to the paper "Direct observation of the particle-phase bicyclic products from OH-initiated oxidation of 1,3,5-trimethylbenzene under NOx-free conditions" by Lin et al. (2022).
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http://dx.doi.org/10.1016/j.dib.2022.108152 | DOI Listing |
Environ Sci Technol
January 2025
CNRS, IRCELYON, UMR 5256, Université Claude Bernard Lyon 1, F-69100 Villeurbanne, France.
While biomass burning (BB) is the largest source of fine particles in the atmosphere, the influence of relative humidity (RH) and photochemistry on BB secondary organic aerosol (BB-SOA) formation and aging remains poorly constrained. These effects need to be addressed to better capture and comprehend the evolution of BB-SOA in the atmosphere. Cresol (CHO) is used as a BB proxy to investigate these effects.
View Article and Find Full Text PDFEnviron Sci Technol
December 2024
Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.
3-Methylenebutane-1,2,4-triol and 3-methyltetrahydrofuran-2,4-diols, previously designated "C-alkene triols", were recently confirmed as in-particle isomerization products of isoprene-derived β-IEPOX isomers that are formed upon acid-driven uptake and partition back into the gas phase. In chamber experiments, we have systematically explored their gas phase oxidation by hydroxyl radical (OH) as a potential source of secondary organic aerosol (SOA). OH-initiated oxidation of both compounds in the presence of ammonium bisulfate aerosol resulted in substantial aerosol volume growth.
View Article and Find Full Text PDFNew particle formation (NPF) in the tropical upper troposphere is a globally important source of atmospheric aerosols. It is known to occur over the Amazon basin, but the nucleation mechanism and chemical precursors have yet to be identified. Here we present comprehensive in situ aircraft measurements showing that extremely low-volatile oxidation products of isoprene, particularly certain organonitrates, drive NPF in the Amazonian upper troposphere.
View Article and Find Full Text PDFJ Phys Chem A
December 2024
Department of Physics, Bharathiar University, Coimbatore 641046, India.
The hydrogen shift reactions of peroxy radicals derived from the ȮH-initiated oxidation of three atmospherically important monoterpenes, limonene, α-pinene, and β-pinene, have been studied. The Bell-Evans-Polanyi relationship (BEPR), Marcus cross relationship (MCR), and Robert-Steel relationship (RSR) are employed to study the factors that contribute to the kinetics of the H-shift reactions. Our results show distinct kinetic behaviors based on the size of the transition-state ring, the functional group present at the H atom abstraction site, and the type of carbon-centered radical formed.
View Article and Find Full Text PDFPhys Chem Chem Phys
October 2024
Department of Chemistry, KU Leuven, Celestijnenlaan, 200F, Leuven 3001, Belgium.
In this study, we revisited the mechanism of isoprene oxidation by OH radicals, focusing on the formation of hydroperoxyaldehydes (HPALDs) in the reactions following O-addition at the α-position to ,'-OH-allyl radical products of the 1,6-H shift of the 1st-generation -δ-OH-isoprenylperoxy radicals. Utilizing high-level quantum chemical calculations and a master equation approach, we provide theoretical confirmation that the formation of δ-HPALDs dominates by far and show that production of β-HPALDs by the mechanism proposed by Wennberg (, 2018, , 3337-3390) is negligible. Besides the dominance of the δ-HPALD formation channel, our investigation also reveals a novel though minor reaction channel resulting in the formation of an allylic δ-hydroperoxy acid and OH radical.
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