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A platform for research: civil engineering, architecture and urbanism
Molecular identification of organic acid molecules from α-pinene ozonolysis
https://orcid.org/0000-0002-6630-0896
https://orcid.org/0000-0003-1089-5584
https://orcid.org/0000-0002-1639-1187
Abstract Oxidized organic molecules from ozonolysis of α-pinene are believed to participate in atmospheric new particle formation in forest regions. However, the detailed process of nucleation originated from α-pinene ozonolysis remains unclear. In this study, an atmospheric pressure interface time-of-flight mass spectrometer coupled with a planar differential mobility analyzer (DMA-MS) was applied to investigate the gas-phase reaction of α-pinene and ozone. Ion mobility and mass to charge ratio of the oxidized molecules were simultaneously measured. The ion mobility distribution of these oxidation products highlighted three mobility diameter ranges: 0.89–0.99 nm, 1.16–1.24 nm and 1.31–1.38 nm, where the dominating molecules were CH2O2, C7-10H10-20O3-7 and C19-20H30-32O6-9, respectively. Combining the DMA-MS measurements, quantum chemistry calculations, and ion mobility modeling, the dominant monomer (C10H16O3) was confirmed as pinonic acid while the primary dimer (C20H32O6) was considered as pinonic acid cluster ((C10H16O3)2). Considering the yield of pinonic acid produced from α-pinene ozonolysis (2–4%), (C10H16O3)2 potentially accounts for part of the nocturnal C20 dimers and ungrowable sub-2-nm particles in forests. Our work provides a new method to facilitate the understanding of atmospheric nucleation and initial growth.
Highlights A novel method to characterize molecular structures is introduced. The dominating products of α-pinene ozonolysis are confirmed to be organic acid molecules and clusters. Pinonic acid cluster potentially accounts for part of the nocturnal C20 dimers and ungrowable sub-2-nm particles in forests.
Molecular identification of organic acid molecules from α-pinene ozonolysis
https://orcid.org/0000-0002-6630-0896
https://orcid.org/0000-0003-1089-5584
https://orcid.org/0000-0002-1639-1187
Abstract Oxidized organic molecules from ozonolysis of α-pinene are believed to participate in atmospheric new particle formation in forest regions. However, the detailed process of nucleation originated from α-pinene ozonolysis remains unclear. In this study, an atmospheric pressure interface time-of-flight mass spectrometer coupled with a planar differential mobility analyzer (DMA-MS) was applied to investigate the gas-phase reaction of α-pinene and ozone. Ion mobility and mass to charge ratio of the oxidized molecules were simultaneously measured. The ion mobility distribution of these oxidation products highlighted three mobility diameter ranges: 0.89–0.99 nm, 1.16–1.24 nm and 1.31–1.38 nm, where the dominating molecules were CH2O2, C7-10H10-20O3-7 and C19-20H30-32O6-9, respectively. Combining the DMA-MS measurements, quantum chemistry calculations, and ion mobility modeling, the dominant monomer (C10H16O3) was confirmed as pinonic acid while the primary dimer (C20H32O6) was considered as pinonic acid cluster ((C10H16O3)2). Considering the yield of pinonic acid produced from α-pinene ozonolysis (2–4%), (C10H16O3)2 potentially accounts for part of the nocturnal C20 dimers and ungrowable sub-2-nm particles in forests. Our work provides a new method to facilitate the understanding of atmospheric nucleation and initial growth.
Highlights A novel method to characterize molecular structures is introduced. The dominating products of α-pinene ozonolysis are confirmed to be organic acid molecules and clusters. Pinonic acid cluster potentially accounts for part of the nocturnal C20 dimers and ungrowable sub-2-nm particles in forests.
Molecular identification of organic acid molecules from α-pinene ozonolysis
https://orcid.org/0000-0002-6630-0896
https://orcid.org/0000-0003-1089-5584
https://orcid.org/0000-0002-1639-1187
Abstract Oxidized organic molecules from ozonolysis of α-pinene are believed to participate in atmospheric new particle formation in forest regions. However, the detailed process of nucleation originated from α-pinene ozonolysis remains unclear. In this study, an atmospheric pressure interface time-of-flight mass spectrometer coupled with a planar differential mobility analyzer (DMA-MS) was applied to investigate the gas-phase reaction of α-pinene and ozone. Ion mobility and mass to charge ratio of the oxidized molecules were simultaneously measured. The ion mobility distribution of these oxidation products highlighted three mobility diameter ranges: 0.89–0.99 nm, 1.16–1.24 nm and 1.31–1.38 nm, where the dominating molecules were CH2O2, C7-10H10-20O3-7 and C19-20H30-32O6-9, respectively. Combining the DMA-MS measurements, quantum chemistry calculations, and ion mobility modeling, the dominant monomer (C10H16O3) was confirmed as pinonic acid while the primary dimer (C20H32O6) was considered as pinonic acid cluster ((C10H16O3)2). Considering the yield of pinonic acid produced from α-pinene ozonolysis (2–4%), (C10H16O3)2 potentially accounts for part of the nocturnal C20 dimers and ungrowable sub-2-nm particles in forests. Our work provides a new method to facilitate the understanding of atmospheric nucleation and initial growth.
Highlights A novel method to characterize molecular structures is introduced. The dominating products of α-pinene ozonolysis are confirmed to be organic acid molecules and clusters. Pinonic acid cluster potentially accounts for part of the nocturnal C20 dimers and ungrowable sub-2-nm particles in forests.
Molecular identification of organic acid molecules from α-pinene ozonolysis
Gao, Jian (author) / Xu, Zhengning (author) / Cai, Runlong (author) / Skyttä, Aurora (author) / Nie, Wei (author) / Gong, Xiaoli (author) / Zhu, Liyao (author) / Cui, Shixuan (author) / Pei, Xiangyu (author) / Kuang, Binyu (author)
Atmospheric Environment ; 312
2023-08-22
Article (Journal)
Electronic Resource
English
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