Spectroscopic diagnostics of a strongly inhomogeneous optically thick plasma. Part 2. Determination of atom concentration and variations of different physical values in the plasma cross-section using asymmetric self-reversed emission and absorption lines

Fishman, I. S.; Il'in, G. G.; Салахов, М. Х.

doi:10.1016/0584-8547(95)01263-e

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…Fishman et al [88] used asymmetric self-absorbed spectral lines to measure the atom density and several parameters involving the plasma cross-section. They put forward an approach for determination of the electron and atom densities in plasma by measuring the characterization parameters of the self-absorbed or even self-reversed lines.…”

Section: Utilizationsmentioning

confidence: 99%

Mechanisms and efficient elimination approaches of self-absorption in LIBS

Hou

Zhang

2019

Plasma Sci. Technol.

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Laser-induced breakdown spectroscopy (LIBS) is a promising analytical spectroscopy technology based on spectroscopic analysis of the radiation emitted by laser-produced plasma. However, for quantitative analysis by LIBS, the so-called self-absorption effects on the spectral lines, which affect plasma characteristics, emission line shapes, calibration curves, etc, can no longer be neglected. Hence, understanding and determining the self-absorption effects are of utmost importance to LIBS research. The purpose of this review is to provide a global overview of self-absorption in LIBS on the issues of experimental observations and adverse effects, physical mechanisms, correction or elimination approaches, and utilizations in the past century. We believe that better understanding and effective solving the self-absorption effect will further enhance the development and maturity of LIBS.

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Section: Utilizationsmentioning

confidence: 99%

Mechanisms and efficient elimination approaches of self-absorption in LIBS

Hou

Zhang

2019

Plasma Sci. Technol.

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“…This results in the LIP to approach a black body emitter at initial delay times. Moreover, it must be mentioned that different research groups [37][38][39][40][41] discussed about spectrum analysis and extraction of plasma parameters in symmetric and asymmetric selfreversal line shapes produced by different sources that can be studied by readers for completeness of information.…”

Section: Inhomogeneous Plasmamentioning

confidence: 99%

Optically Thick Laser-Induced Plasmas in Spectroscopic Analysis

Rezaei¹

2016

Plasma Science and Technology - Progress in Physical States and Chemical Reactions

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Studies on the plasma physics has been grown over the past few decades as a major research field. The plasma can be produced by different sources such as acr, spark, electric discharge, laser and so on. The spectral radiation of the plasma which acts as its fingerprint, contains valuable information about plasma features. Characterization of plasmas by spectroscopic measurement is a powerful tool for increasing the knowledge and applications of these kinds of radiation sources. Therefore, the spectral diagnostics methods are proposed which are based on measurement of spectral lines intensity, estimation of continuous and absorption radiation, and as well as determination of shifts and halfwiths of the spectrum [1]. The fundamental characteristic parameters of the plasma, i.e., the number densities of plasma species, electron temperature, and as well as particle transport property at each plasma space can be determined by optical emission spectroscopy and utilizing appropriate methods [2]. For accurate evaluation of plasma parameters, its thickness must be thoroughly considered. Generally, the plasmas can be separated into two categories of thin and thick groups. In thin plasmas, the re-absorption of radiation is negligible. Consequently, in spectroscopic analysis, the non-self-absorbed spectral radiation is evaluated by considering the summation of all spectral emissions along the line of sight. In optically thick plasmas, the radiation trapping happens which leads to the selfabsorption phenomenon in spectroscopic analysis that is explained with details in below section.

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“…Fishman et al [13][14][15] have developed a method for diagnostics of optically thick inhomogeneous plasmas using asymmetric self-reversed spectral lines. Such plasma characteristics as the temperature, 13 the electron impact half-width, and the distributions of electrons and atoms inside the plasma 14,15 were determined based on the modified Cowan-Dieke 6 and Bartels 7 theories.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Maximum Temperature at the Center of an Optically Thick Laser-Induced Plasma Using Self-Reversed Spectral Lines

et al. 2004

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A method of temperature measurement based on the model developed by Bartels of an optically thick inhomogeneous plasma was applied to a laser plasma induced on a target containing barium. The method involves the intensity ratio measurement of two self-reversed Ba(II) lines. The temperature thus determined corresponds to the maximum temperature in the plasma center. The plasma temperature was measured for delay times between 0.5 micros and 10 micros in two spectrometer operating modes: the scanning mode and the dual-wavelength mode, the latter resulting in better precision. A detailed analysis of experimental errors was performed. The error strongly depended on the wavelength separation of the lines used. The most accurate results were obtained for the largest line separation. Using one line in the UV and the other in the visible region, the relative error was 2-6% for temperatures between 8000 K and 20 000 K. The distribution of the plasma temperature along the plasma height was measured in the same delay time range. The temperature was found to be uniform along the plasma vertical axis, thus confirming the plasma cylindrical symmetry.

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Spectroscopic diagnostics of a strongly inhomogeneous optically thick plasma. Part 2. Determination of atom concentration and variations of different physical values in the plasma cross-section using asymmetric self-reversed emission and absorption lines

Cited by 6 publications

References 6 publications

Mechanisms and efficient elimination approaches of self-absorption in LIBS

Mechanisms and efficient elimination approaches of self-absorption in LIBS

Optically Thick Laser-Induced Plasmas in Spectroscopic Analysis

Determination of the Maximum Temperature at the Center of an Optically Thick Laser-Induced Plasma Using Self-Reversed Spectral Lines

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