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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Determination of the H-2/H-1, O-17/O-16, and O-18/O-16 isotope ratios in water by means of tunable diode laser spectroscopy at 1.39 mu m
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Determination of the H-2/H-1, O-17/O-16, and O-18/O-16 isotope ratios in water by means of tunable diode laser spectroscopy at 1.39 mu m

机译：通过可调二极管激光光谱在1.39微米下测定水中的H-2 / H-1，O-17 / O-16和O-18 / O-16同位素比

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摘要

We demonstrate the feasibility of the accurate and simultaneous measurement of the H-2/H-1, O-17/O-16, and O-18/O-16 isotope ratios in water vapor by means of tunable diode laser spectroscopy. The absorptions are due to the nu(1) + nu(3) combination band, observed using a room temperature, distributed feedback (DFB) diode laser at 1.39 mum. The precision of the instrument is approximately 3, 1, and 0.5% for the H-2, O-17, and O-18 isotope ratios, respectively, and is at present limited by residual optical feedback to the laser. The signal-to-noise, however, is superior to that obtained in a similar experiment using a color center laser at 2.7 mum. Replacing the current laser with a better unit, we are confident that a precision well below 1parts per thousand is attainable for all three isotope ratios. The diode laser apparatus is ideally suited for applications demanding a reliable, cheap, and/or portable instrument, such as the biomedical doubly labeled water method and atmospheric sensing. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 24]
机译：我们展示了可调谐二极管激光光谱法同时准确测量水蒸气中H-2 / H-1，O-17 / O-16和O-18 / O-16同位素比的可行性。吸收归因于nu（1）+ nu（3）组合带，使用室温，1.39微米的分布式反馈（DFB）二极管激光器观察到。对于H-2，O-17和O-18同位素比率，仪器的精度分别约为3％，1％和0.5％，并且目前受到对激光器的残留光反馈的限制。但是，信噪比优于使用2.7毫米色中心激光的类似实验中获得的信噪比。用更好的单元替换当前的激光器，我们相信，对于所有三种同位素比率，其精度都可以达到千分之一以下。二极管激光设备非常适合需要可靠，便宜和/或便携式仪器的应用，例如生物医学双标签水法和大气传感。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：24]

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