中央研究院原子與分子科學研究所 - 研究人員資訊 (Institute of Atomic and Molecular Sciences, Academia Sinica)

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羅佩凌博士 (化學動態學與光譜組)

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I-Yun Chen, Che-Wei Chang, Christa Fittschen, and Pei-Ling Luo*

J. Phys. Chem. Lett.,15, 3733–3739 (2024)

Accurate kinetic studies of OH + HO2 radical–radical reaction through direct measurement of precursor and radical concentrations with high-resolution time-resolved dual-comb spectroscopy

The radical–radical reaction between OH and HO₂ has been considered for a long time as an important reaction in tropospheric photochemistry and combustion chemistry. However, a significant discrepancy of an order of magnitude for rate coefficients of this reaction is found between two recent experiments. Herein, we investigate the reaction OH + HO₂ via direct spectral quantification of both the precursor (H₂O₂) and free radicals (OH and HO₂) upon the 248 nm photolysis of H₂O₂ using infrared two-color time-resolved dual-comb spectroscopy. With quantitative and kinetic analysis of concentration profiles of both OH and HO₂ at varied conditions, the rate coefficient k_OH+HO2 is determined to be (1.10 ± 0.12) × 10^–10 cm³ molecule^–1 s^–1 at 296 K. Moreover, we explore the kinetics of this reaction under conditions in the presence of water, but no enhancement in the kOH+HO2 can be observed. This work as an independent experiment plays a crucial role in revisiting this prototypical radical–radical reaction.

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中央研究院 原子與分子科學研究所

羅佩凌 博士 (化學動態學與光譜組)

羅佩凌博士 (化學動態學與光譜組)