Study of hydrogen and deuterium emission characteristics in laser-induced low-pressure helium plasma for the suppression of surface water contamination
Study of hydrogen and deuterium emission characteristics in laser-induced low-pressure helium plasma for the suppression of surface water contamination
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DOI：
10.1021/ac7020213
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发表时间：
2008-02-15
影响因子：
7.4
通讯作者：
Tjia, May On
中科院分区：
文献类型：
--
作者：
Munadi;Pardede, Marincan;Tjia, May On
利用激光诱导低压氦等离子体光谱法对氢分析中地表水引起的光谱干扰进行了抑制所需的实验条件研究。由于难以区分样品内部的氢杂质和来自水分子的氢发射而引起的问题，通过利用氢和氘共有的相似发射特性来克服了这个问题。在本实验中，D掺杂锆合金-4样品的D和H发射强度的明显的时间依赖性和压力依赖性变化表明了氢和氘共有的相似发射特性。这种相似性允许从D掺杂样品的D发射来研究H杂质发射，从而将其与源自水分子的H发射分离开来。采用这一策略，当使用34 mJ的激光束在紧密聚焦条件下时，我们实现了对水诱导光谱干扰的较大抑制，从之前的最小值400 μ g/g到目前的30 μ g/g。除了这一有利结果外，该实验条件还提供了更好的（约6倍高）空间分辨率，尽管这些结果是以将线性校准范围从以前的4300 μ g/g降低到目前的200 μ g/g为代价的。
An experimental study was conducted in search of the experimental condition required for the much needed suppression of spectral interference caused by surface water in hydrogen analysis using laser-induced low-pressure helium plasma spectroscopy. The problem arising from the difficulty in distinguishing hydrogen emission from hydrogen impurity inside the sample and that coming from the water molecules was overcome by taking advantage of similar emission characteristics shared by hydrogen and deuterium demonstrated in this experiment by the distinct time-dependent and pressure-dependent variations of the D and H emission intensities from the D-doped zircaloy-4 samples. This similarity allows the study of H impurity emission in terms of D emission from the D-doped samples and thereby separating it from the H emission originating from the water molecules. Employing this strategy has allowed us to achieve the large suppression of water induced spectral interference from the previous minimum of 400 mu g/g to the current value of 30 mu g/g when a laser beam of 34 mJ under tight focusing condition was employed. Along with this favorable result, this experimental condition has also provided a much better (about 6-fold higher) spatial resolution, although these results were achieved at the expense of reducing the linear calibration range from the previous 4 300 mu g/g to the present 200 mu g/g.