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High precision methane isotopologue ratio measurements at ambient mixing ratios using integrated cavity output spectroscopy

机译:使用集成腔输出光谱仪在环境混合比下进行高精度甲烷同位素比测量

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摘要

The demonstration of an ultra-sensitive infrared spectro-scopic technique for analysis of carbon isotopologues of methane is presented. Using off-axis integrated cavity output spectroscopy (ICOS) near 1294 cm~(-1), we have achieved a δ~(13)C measurement precision of 1.5‰ in 1 s and 0.21‰ in 200 s while sampling dry air with a ~(12)CH_4 mixing ratio of 1.846 ppmv. This method will allow for high time response, high-sensitivity stable isotope analysis in the troposphere without the need for sample preconcentration, and could have major implications for better understanding of carbon-cycle dynamics. This work also addresses the relationship between the scanning frequency of the laser, the characteristic cavity frequency, and the line shapes of spectral features in ICOS.
机译:演示了用于分析甲烷碳同位素异构体的超灵敏红外光谱技术的演示。使用1294 cm〜(-1)附近的离轴集成腔输出光谱(ICOS),我们在对干燥空气进行采样的同时,在1 s中获得了1.5‰的δ〜(13)C测量精度,在200 s中获得了0.21‰的δ〜(13)C测量精度。 〜(12)CH_4的混合比为1.846 ppmv。该方法无需对样品进行预浓缩即可进行对流层中的高时间响应,高灵敏度的稳定同位素分析,并且可能对更好地理解碳循环动力学具有重要意义。这项工作还解决了激光器的扫描频率,特征腔频率和ICOS中光谱特征的线形之间的关系。

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  • 来源
    《Applied physics》 |2011年第2期|p.375-380|共6页
  • 作者单位

    Department of Chemistry and Chemical Biology,Harvard University, 12 Oxford St., Cambridge, MA 02138, USA;

    School of Engineering and Applied Sciences, Harvard University,20 Oxford St., Cambridge, MA 02138, USA;

    Department of Chemistry and Chemical Biology,Harvard University, 12 Oxford St., Cambridge, MA 02138, USA,School of Engineering and Applied Sciences, Harvard University,20 Oxford St., Cambridge, MA 02138, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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