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| DOI | 10.5194/acp-2020-642 |
| Technical Note: Effect of varying the λ = 185 and 254 nm photon flux ratio on radical generation in oxidation flow reactors | |
| Jake P. Rowe, Andrew T. Lambe, and William H. Brune | |
| 2020-07-07 | |
| 发表期刊 | Atmospheric Chemistry and Physics
 |
| 出版年 | 2020 |
| 英文摘要 | Oxidation flow reactors (OFRs) complement environmental smog chambers as a portable, low-cost technique for exposing atmospheric compounds to oxidants such as ozone (O3) and hydroxyl (OH) radicals. OH is most commonly generated in OFRs via photolysis of externally added O3 at λ = 254 nm (OFR254), or combined photolysis of O2 and H2O at λ = 185 nm plus photolysis of O3 at λ = 254 nm (OFR185) using low-pressure mercury (Hg) lamps. Whereas OFR254 radical generation is influenced by [O3], [H2O], and photon flux at λ = 254 nm (I254), OFR185 radical generation is influenced by [O2], [H2O], I185, and I254. Because the ratio of photon fluxes, I185 : I254, is OFR-specific, OFR185 performance varies between different systems even when constant H2O and I254 are maintained. Thus, calibrations and models developed for one OFR185 system may not be applicable to another. To investigate these issues, we conducted a series of experiments in which I185 : I254 emitted by Hg lamps installed in an OFR was systematically varied by fusing multiple segments of lamp quartz together that either transmitted or blocked 185 nm radiation. Integrated OH exposure (OHexp) values achieved for each lamp type were obtained using the tracer decay method as a function of UV intensity, humidity, residence time, and external OH reactivity (OHRext). Following previous related studies, a photochemical box model was used to develop a generalized OHexp estimation equation as a function of [H2O], [O3] and OHRext that is applicable for I185 : I254 ≈ 0.001 to 0.1. |
| 领域 | 地球科学 |
| URL | 查看原文 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/282661 |
| 专题 | 地球科学 |
| 推荐引用方式 GB/T 7714 | Jake P. Rowe, Andrew T. Lambe, and William H. Brune. Technical Note: Effect of varying the λ = 185 and 254 nm photon flux ratio on radical generation in oxidation flow reactors[J]. Atmospheric Chemistry and Physics,2020. |
| APA | Jake P. Rowe, Andrew T. Lambe, and William H. Brune.(2020).Technical Note: Effect of varying the λ = 185 and 254 nm photon flux ratio on radical generation in oxidation flow reactors.Atmospheric Chemistry and Physics. |
| MLA | Jake P. Rowe, Andrew T. Lambe, and William H. Brune."Technical Note: Effect of varying the λ = 185 and 254 nm photon flux ratio on radical generation in oxidation flow reactors".Atmospheric Chemistry and Physics (2020). |
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