Journal ArticleDOI
Atomic Emission Characteristics of Laser-Induced Plasmas in an Argon Atmosphere at Reduced Pressure
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In this article, the emission characteristics of laser-induced plasma, with the use of a Q-switched ruby laser of 1.5 J, were studied in argon atmosphere at reduced pressure.Abstract:
The emission characteristics of laser-induced plasma, with the use of a Q-switched ruby laser of 1.5 J, were studied in argon atmosphere at reduced pressure. The time- and spatially resolved emission profiles were measured. In argon atmosphere at reduced pressure, the emission period of plasma is elongated to over a hundred microseconds, and the emissive region expands to more than a few tens of millimeters above the sample surface. The emission intensities of atomic lines increase severalfold in an argon atmosphere, in comparison with those obtained in air at the same pressure. Moderate confinement of plasmas and a resultant increase of emission intensities are achieved at 50 Torr. These results are explained by the chemical inertness and the thermal characteristics of the argon atmosphere and the decrease in absorption of the laser pulse by the plasma plume. The re-excitation of emissive species by collisions with metastable argon atoms seems to be less important.read more
Citations
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Journal ArticleDOI
Laser-induced breakdown spectroscopy (LIBS), part II: review of instrumental and methodological approaches to material analysis and applications to different fields.
David W. Hahn,Nicoló Omenetto +1 more
TL;DR: The current state-of-the-art of analytical LIBS is summarized, providing a contemporary snapshot of LIBS applications, and highlighting new directions in laser-induced breakdown spectroscopy, such as novel approaches, instrumental developments, and advanced use of chemometric tools are discussed.
Journal ArticleDOI
Fundamentals and Applications of Laser-Induced Breakdown Spectroscopy
TL;DR: In this paper, the authors reviewed the literature on laser-induced breakdown spectroscopy by dividing the literature into three categories according to target phase: solid, liquid, or gas.
Journal ArticleDOI
Quantitative Analysis of Aluminum Alloys by Laser-Induced Breakdown Spectroscopy and Plasma Characterization
Mohamad Sabsabi,Paolo Cielo +1 more
TL;DR: In this paper, a laser-induced breakdown spectroscopy was applied to perform elemental analysis of aluminum alloy targets, and a plasma was generated by focusing a pulsed Nd:YAG laser on the target in air at atmospheric pressure.
Journal ArticleDOI
Effects of atmosphere on laser vaporization and excitation processes of solid samples
TL;DR: In this article, the effects of atmosphere on the laser vaporization and excitation processes were investigated with spectral measurements and with the direct measurement of vaporized weight of samples, which were positioned in three different atmospheres, i.e. air, argon and helium, from atmospheric pressure to a pressure reduced to a few torr.
Journal ArticleDOI
Spark discharge assisted laser induced breakdown spectroscopy
TL;DR: In this article, a spark discharge laser induced breakdown spectroscopy (SD-LIBS) was evaluated for Al and Cu targets in air under atmospheric pressure, and significant enhancement in measured line intensities and the signal-to-background ratios, which depend on the spark discharge voltage and the laser fluence, was observed.
References
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Journal ArticleDOI
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TL;DR: In this article, the results of experiments performed with a new version of a free-running 50-MHz RF generator for producing an inductively coupled plasma (ICP) with two gas flows (argon) were investigated.
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R.H. Scott,A. Strasheim +1 more
TL;DR: In this article, a series of high speed photographs are presented which show the crater and plasma formation when pulsed laser light is focussed onto the surface of a metal, and features of the evaporation process are discussed.
Journal ArticleDOI
Atmospheric Influences on Q-Switched Laser Sampling and Resulting Plumes:
Edward H. Piepmeier,D. E. Osten +1 more
TL;DR: When a 10-100mJ single-spike Q-switched Nd laser pulse is focused on a copper sample, the presence of an atmosphere affects the spectra, the crater size, and the amount of sample vaporized as discussed by the authors.
Journal ArticleDOI
Characteristics of the plasma induced by the bombardment of N2 laser pulse at low pressures
TL;DR: In this article, a study on the characteristics of the plasma, namely, the spatial distribution of the emission intensity, the time behavior of the spatial displacement and the excitation temperature, under various conditions of the surrounding gas (pressure range between 0.02 and 6 torr in He, Ar, N 2 and CO 2 ).
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