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Confinement and Enhancement of an Airborne Atmospheric Laser-Induced Plasma by an Ultrasonic Acoustic Resonator

Abstract

Optical elemental analysis in the gas-phase typically relies on electrically-driven plasmas. As an alternative approach, laser-driven plasmas have been suggested but are so far 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 is detrimental for analytical purposes. The resulting setup yields in a fourfold signal enhancement while the background contribution of ubiquitous air is at the same time effectively suppressed. Since the entire enhancement effect occurs contactless, no additional sources for abrasive sample contamination are introduced.

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Publication details

The article was received on 29 Aug 2017, accepted on 20 Nov 2017 and first published on 22 Nov 2017


Article type: Paper
DOI: 10.1039/C7JA00297A
Citation: J. Anal. At. Spectrom., 2017, Accepted Manuscript
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    Confinement and Enhancement of an Airborne Atmospheric Laser-Induced Plasma by an Ultrasonic Acoustic Resonator

    A. Bierstedt, U. Panne and J. Riedel, J. Anal. At. Spectrom., 2017, Accepted Manuscript , DOI: 10.1039/C7JA00297A

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