{"title":"Quantitative measurement of CN radical in a low-pressure methane/air flame by cavity ring-down spectroscopy","authors":"Xavier Mercier, Laure Pillier, Jean-François Pauwels, Pascale Desgroux","doi":"10.1016/S1296-2147(01)01238-0","DOIUrl":null,"url":null,"abstract":"<div><p>The ultrasensitivity of the cavity ring down spectroscopy technique has been used to detect the minor CN species in a premixed rich (<em>φ</em>=1.2) methane/air flame stabilized at 53 hPa. The CN radical has been probed around 387 nm on the B–X (0–0) band. A peak concentration of 4.7·10<sup>9</sup> cm<sup>−3</sup> has been measured which corresponds to a mole fraction of 0.022 ppm. A detection limit of a few ppb has been reached despite the presence of an important off-resonance background due to the flame.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 7","pages":"Pages 965-972"},"PeriodicalIF":0.0000,"publicationDate":"2001-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01238-0","citationCount":"4","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1296214701012380","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 4
Abstract
The ultrasensitivity of the cavity ring down spectroscopy technique has been used to detect the minor CN species in a premixed rich (φ=1.2) methane/air flame stabilized at 53 hPa. The CN radical has been probed around 387 nm on the B–X (0–0) band. A peak concentration of 4.7·109 cm−3 has been measured which corresponds to a mole fraction of 0.022 ppm. A detection limit of a few ppb has been reached despite the presence of an important off-resonance background due to the flame.
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