Measurement of O2 and O3 absorption cross-sections in the 180–270 nm by controlling the conversion of O2 to O3 in the linear-absorption region

IF 1.4 4区物理与天体物理 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

Journal of Molecular Spectroscopy Pub Date : 2025-01-01 DOI:10.1016/j.jms.2024.111984

Shuo Zhao , Jie Gao , Yongqi Wu , Rui Zhu , Mu Li , Wanyi Qin , Xijun Wu , Yungang Zhang

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引用次数: 0

Abstract

Oxygen (O₂) and ozone (O₃) are of crucial importance to human health and environmental sustainability. Concentrations of O₂ and O₃ can be measured by UV absorption spectroscopy, in which the absorption cross-section (ACS) is a very critical physical parameter for calculating concentrations. However, the existing ACS of O₂ and O₃ are biased because the conversion of O₂ to O₃ and nonlinear effects in absorption are ignored in the measurement of ACS. In this study, the ACS for O₂ and O₃ are obtained by considering the conversion of O₂ to O₃ and the nonlinear effects. First, the conversion of O₂ to O₃ is inhibited by controlling gas flow rate and light intensity in the measurement of O₂ and O₃ ACS. Then the concentration of O₃ is indirectly calculated by controlling conversion of O₂ to O₃ during the measurement of ACS of O₃. Next, the linear-absorption regions for O₂ and O₃ are determined by constructing the relationship between absorption intensities and concentrations to eliminate the influence of nonlinear effect. The maximum ACS for oxygen and ozone are

7.84 \times 10^{- 20}

cm²/molecule (

λ

= 180.51 nm) and

1.32 \times 10^{- 17}

cm²/molecule (

λ

= 255.39 nm) by controlling conversion of O₂ to O₃ in the linear-absorption region, respectively.

Abstract Image

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通过在线性吸收区控制O2到O3的转化，测量了180 ~ 270 nm O2和O3的吸收截面

氧（O2）和臭氧（O3）对人类健康和环境可持续性至关重要。紫外吸收光谱法可以测量O2和O3的浓度，其中吸收截面（ACS）是计算浓度的一个非常关键的物理参数。然而，由于在ACS的测量中忽略了O2到O3的转化和吸收中的非线性效应，现有的O2和O3的ACS存在偏差。在本研究中，考虑了O2到O3的转化和非线性效应，得到了O2和O3的ACS。首先，在测量O2和O3 ACS时，通过控制气体流速和光强来抑制O2向O3的转化。然后在测量O3的ACS时，通过控制O2向O3的转化，间接计算出O3的浓度。其次，通过构建吸收强度与浓度之间的关系，确定O2和O3的线性吸收区域，消除非线性效应的影响。通过控制O2在线性吸收区转化为O3，氧和臭氧的最大ACS分别为7.84×10-20 cm2/分子（λ = 180.51 nm）和1.32×10-17 cm2/分子（λ = 255.39 nm）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Molecular Spectroscopy 物理-光谱学

CiteScore

2.70

自引率

21.40%

发文量

审稿时长

29 days

期刊介绍： The Journal of Molecular Spectroscopy presents experimental and theoretical articles on all subjects relevant to molecular spectroscopy and its modern applications. An international medium for the publication of some of the most significant research in the field, the Journal of Molecular Spectroscopy is an invaluable resource for astrophysicists, chemists, physicists, engineers, and others involved in molecular spectroscopy research and practice.