Program

Poster Presentations

Day 1, June 10（Wed.）　　Room P (5F 501+502)

1P-19

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Structural Analysis of α-pinene Dimer

(Yokohama City Univ.)
^oRenta Wakabayashi

Monoterpenes are known as volatile chemical products (VCPs) in shampoos, perfumes, and other fragrance ingredients. Following their emission, these monoterpenes undergo oxidation reactions to form secondary organic aerosols (SOA). Among these precursors, the α-pinene dimer, represented as C₂₀H₃₂, is significantly involved in the complex processes of SOA formation. However, there are still many unresolved aspects regarding its precise molecular structure and detailed formation processes. In this study, the α-pinene dimer was measured by an atmospheric pressure corona discharge ionization mass spectrometry (APCDI-MS), and collision-induced dissociation (CID), and gas chromatography (GC). Consequently, α-pinene dimers that were directly generated as instrumental artifacts within the mass spectrometer were clearly observed. Furthermore, we performed CID experiments that definitively revealed that these artifact dimers actually contain stable covalently bound compounds. Based on these significant findings, it is suggested that the covalently bound dimers generated as artifacts within the instrument likely possess chemical structures remarkably similar to those of the actual dimers naturally present in the atmosphere.

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