Estimation of self-absorption effect on aluminum emission in the presence of different noble gases: comparison between thin and thick plasma emission

Rezaei, Fatemeh; Karimi, Parham; Tavassoli, Seyed Hassan

doi:10.1364/ao.52.005088

Cited by 32 publications

(24 citation statements)

References 44 publications

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“…In the previous work of our group, it was shown that the aluminum spectral lines in argon ambient gas are exposed to more intense self-absorption than in helium noble gas at the mentioned experimental condition [74]. So, since our results on the influences of gas natures on the plasma [74,76], as well as for having smoother spectrum, the analysis in this paper is limited to Al samples in He noble gas.…”

Section: Self-absorption Effectmentioning

confidence: 88%

“…So, since our results on the influences of gas natures on the plasma [74,76], as well as for having smoother spectrum, the analysis in this paper is limited to Al samples in He noble gas. In addition, it should be noted that the details of the influences of the ambient gas natures at different pressure conditions are investigated in Refs.…”

Section: Self-absorption Effectmentioning

confidence: 99%

“…For instance, Cristoforetti et al [63,73] estimated the self-absorption coefficient by considering the ratio of different parameters such as spectral peak intensity, line width, as well as integrated intensity of a specific spectral line in the case of experimental condition (with self-absorption) to the case of thin plasma (without self-absorption). In pervious study of our group [74], the effects of noble gases of He and Ar at 1 atm pressure on laser-induced plasma emission of aluminum sample were investigated. Moreover, a comparison between thin and thick aluminum radiation was carried out.…”

Section: Introductionmentioning

confidence: 99%

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Quantitative analysis of aluminum samples in He ambient gas at different pressures in a thick LIBS plasma

Rezaei

Tavassoli

2015

Appl. Phys. B

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radioactive, high temperature, toxic materials) [19][20][21][22][23][24][25], industry [26][27][28][29][30][31], architecture, medical (noninvasive study of human teeth and hair, diagnosis of cancer tissue, DNA analysis) [32][33][34][35][36][37], military and civil security (detection of explosive material and biological weapons) [38][39][40][41][42][43]. Most of these applications are investigated under the condition of earth's atmosphere (i.e., at 760 Torr in air atmosphere) in order to determine the selected material compositions. Nevertheless, interest in LIBS in other ambient gases with various circumstances has been grown because of its practical application. It should be mentioned that nowadays wide applications of gas effects in space exploration (such as utilizing LIBS for investigating specific conditions on Venus and Mars) [4,44,45] are studied. For instance, in scope of gas pressure, the high-pressure environment serves to replicate the conditions of a nuclear reactor or simulate some planet environments [46]. At the opposite, reduced gas pressures or vacuum is applied for determination of isotope ratios [47][48][49], synthesis of nanoparticles and thin films.Different research groups [50][51][52][53][54][55] have investigated the quantitative analysis of plasma parameters and spectral line properties in LIBS technique by considering the influences of gas conditions. For instance, Effenberger et al. [56] have properly presented a review of applications of different gas effects in LIBS experiment. They have comprehensively mentioned the results of various groups about the effects of atmosphere compositions and gas pressures (higher and lower than 760 Torr) on plasma parameters and spectral line characteristics. Dawood et al. [57] have investigated the effects of gas nature and its pressure on temporal distribution of aluminum plasma. They have explained that both plasma temperature and electron density grow with ambient gas pressure. In addition, they have shown that argon provides the highest temperature and plasma density, helium provides the lowest one, and nitrogen produces Abstract In this paper, the influences of He ambient gas on aluminum emissions are investigated by experimental analysis of LIBS spectrum. Plasma is produced by focusing of a Nd:YAG laser pulse at a wavelength of 1064 nm on Al standard samples. In this work, the effects of helium atmosphere at different pressures on the amount of spectral self-absorption are studied. The results are discussed by utilizing two approaches: the curve of growth and calibration curve. It is seen that by increasing the gas pressure, the self-absorption enhances. Also, a new method of applying one standard sample instead of other traditional techniques is introduced for concentration prediction. The presented method would be helpful for the situation in which supplying standard samples is not very easy. Then, the accuracy of this new method can be checked by comparison of concentration prediction of the standard samples with their real concentrations.

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Section: Self-absorption Effectmentioning

confidence: 88%

Section: Self-absorption Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantitative analysis of aluminum samples in He ambient gas at different pressures in a thick LIBS plasma

Rezaei

Tavassoli

2015

Appl. Phys. B

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“…Plasma Science and Technology -Progress in Physical States and Chemical Reactions Figure 12. Different schematics of nonhomogeneous thick plasmas [10,13,34].…”

Section: Inhomogeneous Plasmamentioning

confidence: 99%

“…Rezaei et al [34] studied the spectral emissions of an aluminum sample located in argon and helium noble gases at 1 atm pressure, by applying a numerical calculation. They computed the plasma parameters by coupling the thermal model of laser ablation, hydrodynamic of plasma expansion, and Saha-Eggert equations.…”

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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Simple defocus laser irradiation to suppress self-absorption in laser-induced breakdown spectroscopy (LIBS)

Marpaung

Harefa

Pardede

et al. 2022

Heliyon

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Estimation of self-absorption effect on aluminum emission in the presence of different noble gases: comparison between thin and thick plasma emission

Cited by 32 publications

References 44 publications

Quantitative analysis of aluminum samples in He ambient gas at different pressures in a thick LIBS plasma

Quantitative analysis of aluminum samples in He ambient gas at different pressures in a thick LIBS plasma

Optically Thick Laser-Induced Plasmas in Spectroscopic Analysis

Simple defocus laser irradiation to suppress self-absorption in laser-induced breakdown spectroscopy (LIBS)

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