オーラルセッション
- 第3日 5月21日（金） 15:25～15:45 E会場（Zoom）
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3E-O15-1525 PDF
クリーギー中間体が作るオリゴマーが関わる新粒子生成に関する研究
Atmospheric aerosols scatter and absorb incoming solar radiation, which directly impacts the global radiative balance of the atmosphere. If these aerosols are hydrophilic, they can act as cloud condensation nuclei (CCN) and have an indirect effect on the climate by modifying the properties of clouds. New particle formation (NPF) through nucleation is believed to contribute up to half of the global CCN concentrations. The nucleation and growth mechanisms of new particles in the atmosphere have therefore been topics of study in atmospheric research. Recently, we observed NPF during ozonolysis of isoprene (C5H8) and ethene (C2H4). We proposed that oligomeric hydroperoxides originated from stabilized Criegee intermediates (sCIs) that were generated during the ozonolysis of isoprene and ethene potentially contribute to the NPF. The similar results were obtained in the ozonolysis of 2-methyl-2-butene (C5H10) and trans-2-butene (C4H8). In the presentation, we will highlight the usefulness of on-line negative ion chemical ionization mass spectrometry to detect gaseous products from ozonolysis of alkenes, resulting in elucidating the link between oligomers involving Criegee intermediates and new particles.