Confinement and enhancement of an airborne atmospheric laser-induced plasma using an ultrasonic acoustic resonator†,Journal of Analytical Atomic Spectrometry

当前位置： X-MOL 学术 › J. Anal. At. Spectrom. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Confinement and enhancement of an airborne atmospheric laser-induced plasma using an ultrasonic acoustic resonator†
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2017-11-22 00:00:00 , DOI: 10.1039/c7ja00297a
Andreas Bierstedt _{1,

2,

3,

4} , Ulrich Panne _{1,

2,

3,

4} , Jens Riedel _{1,

2,

3,

4}

Affiliation

Optical elemental analysis in the gas phase typically relies on electrically driven plasmas. As an alternative approach, laser-induced plasmas (LIPs) have been suggested but have so far been only scarcely used. Here, a novel signal enhancement strategy for laser-based airborne plasma optical emission spectroscopy for gas phase analytics is presented. In contrast to an electrically driven plasma, in the laser-induced analogue dynamic matter transport equilibrium builds up. The latter results in a rarefied density regime in the plasma core itself, surrounded by an area of compressed matter. The central rarefaction leads to a decrease in plasma intensity and analyte number density, both of which are detrimental for analytical purposes. Since the repetitive ignition of LIPs is a transient process, a restoration of the former gaseous medium by other dynamically equilibrated diffusion processes would be favourable. The presented combination of an airborne LIP and an ultrasonic acoustic resonator yields a fourfold signal enhancement while the background contribution of ubiquitous air is at the same time effectively suppressed. Since the entire enhancement effect occurs without contact, no additional sources for abrasive sample contamination are introduced.

中文翻译：

使用超声谐振器限制和增强机载大气激光诱导的等离子体†

气相中的光学元素分析通常依赖于电驱动等离子体。作为一种替代方法，已经提出了激光诱导等离子体（LIP），但到目前为止几乎没有使用。在这里，提出了一种新颖的信号增强策略，用于基于激光的航空等离子体光发射光谱用于气相分析。与电驱动等离子体相反，在激光诱导的模拟动态物质中，传输平衡得以建立。后者导致等离子体核本身的稀疏密度状态，被压缩物质区域包围。中央稀疏化导致血浆强度和分析物数量密度的降低，这两者对于分析目的都是有害的。由于LIP的重复点火是一个短暂的过程，通过其他动态平衡的扩散过程恢复以前的气态介质将是有利的。所提出的机载LIP和超声谐振器的组合产生了四倍的信号增强，同时有效地抑制了无处不在的空气的本底贡献。由于整个增强效果是在没有接触的情况下发生的，因此不会引入其他污染磨料的来源。

更新日期：2017-11-22

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11