Abstract
The results of an experimental study of the optical emission enhancement possibilities during the single pulse laser induced breakdown spectroscopy of the aluminum alloy are presented. This study is performed in air, argon and helium at different pressures with and without the additional fast electric discharge. The discharge was initiated by plasma plume created by laser ablation of target. The influences of various capacitors and discharge voltages on enhancement of the studied spectral line intensities were also studied. The application of the fast discharge through optical emission enhancement enables lowering of detection limits thus making this spectrochemical method comparable with the other analytical techniques.
Highlights
The application of lasers for analytical purposes started only three years after their introduction [1,2]
The spectral recordings of this plasma showed lines of all elements present in the sample. This fact opened the possibility for a new analytical technique – laser-induced breakdown spectroscopy – LIBS
The development of the intensified CCD cameras enabled further gains in the recorded signal. Techniques such as inductively coupled plasma-mass spectrometry (ICP-MS) were still favorable. These LIBS disadvantages were mainly overcome by enhancing optical emission with the use of the additional laser pulse in different double pulse technique configurations – DP-LIBS [2,3,4,5,6]
Summary
The application of lasers for analytical purposes started only three years after their introduction [1,2]. In order to find the conditions for the enhancement of analytical line intensities, it is important to ensure that fast pulse discharge will be initiated by laser pulse after a minimum delay.
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