Determination of excitation temperature in laser-induced plasmas using columnar density Saha-Boltzmann plot

Safi, Ali; Tavassoli, Seyed Hassan; Cristoforetti, G.; Legnaioli, Stefano; Palleschi, Vincenzo; Rezaei, Fatemeh; Tognoni, E.

doi:10.1016/j.jare.2019.01.008

Cited by 36 publications

(18 citation statements)

References 40 publications

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“…The electron density has been calculated from the Hα line at 656.27 nm using LIBS ++ software. 41 Hydrogen emission comes from the air surrounding the plasma, where the electron density measurements from the Hα line are free from self-absorption. 42 The electron density values were more than 10 16 under the selected parameters, which verify LTE’s McWhirter criterion in Eq.…”

Section: Resultsmentioning

confidence: 99%

Gold Nanoparticle-Enhanced Laser-Induced Breakdown Spectroscopy and Three-Dimensional Contour Imaging of an Aluminum Alloy

2020

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In the present work, nanoparticles-enhanced laser-induced breakdown spectroscopy (N.E.L.I.B.S.) has been used to analyze aluminum alloy. Though LIBS has numerous advantages, it suffers from low sensitivity and low detection limits compared to other spectrochemical analytical methods. However, using gold nanoparticles helps to overcome such drawbacks and enhances the LIBS sensitivity in analyzing aluminum alloy in the current work. Aluminum is the major element in the analyzed samples (99.9%), while Magnesium (Mg) is the minor element (0.1%). Spread of gold nanoparticles onto the Al alloy and using a laser with different pulse energies have been exploited to enhance the Al alloy spectral lines. The results showed that Au NPs had successfully improved the alloy spectral lines intensity by eight times, which could be useful for detecting many trace elements in higher matrix alloys. Under the assumption of local thermodynamic equilibrium (LTE), the Boltzmann plot has been used to calculate the plasma temperature. . Besides, the electron density was calculated using Mg and H lines at Mg (I) at 285.2 nm and HÎ± (I) at 656.2 nm, respectively. 3D contour mapping and color fill images contributed to understanding the behavior of the involving effects.

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Section: Resultsmentioning

confidence: 99%

Gold Nanoparticle-Enhanced Laser-Induced Breakdown Spectroscopy and Three-Dimensional Contour Imaging of an Aluminum Alloy

2020

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“…The temperature of generated plasma was determined using an accurate and simple procedure known as Boltzmann plot [22,27]. The plasma temperature was estimated by including the optically thin spectral lines with spectroscopic data from NIST database.…”

Section: Measurement Of Plasma Temperaturementioning

confidence: 99%

“…The method parameters depend on laser irradiance, wavelength, pulse duration, target material, atmospheric conditions, space, and time. Different studies have shown that using an optically thin LIBS, the excitation temperature that controls the distribution of energy level excitation can be determined by Boltzmann equation [22,23], while the ionization temperature can be estimated by ionization equilibrium calculations using Saha equation which is known as plasma [24,25]. In the present work, tests were conducted to determine major and trace elements of an important medicinal plant ZA collected from the district Bagh, Azad Jammu and Kashmir, Pakistan.…”

Section: Introductionmentioning

confidence: 96%

Use of laser-induced break spectroscopy for the determination of major and trace elements in Zanthoxylum armatum

Shahida¹,

Khan

Azad³

et al. 2020

emergent mater.

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Zanthoxylum armatum (ZA) is a medicinal plant (MP) that is widely distributed in hilly and moist areas and has a different medical effect on human curative functions. Laser-induced breakdown spectroscopy (LIBS) was employed as a simple, easy, and accurate method to analyze the elemental profile of Zanthoxylum armatum (ZA) (timur). Various elements present in different parts of ZA were identified including sodium, magnesium, calcium, potassium, titanium, iron, barium, aluminum, lithium, and silicon. The proposed method accuracy was found to be comparable with high technical complicated lab equipment The concentrations of these elements were determined and were found to be below the toxic level.

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“…A precise calculation of the plasma electron temperature is important for the quantitative study of the plasma composition. While many spectroscopic techniques are required for the calculation of the excitation temperatures in LIBS, the Saha-Boltzmann plot method is the most popular (Safi et al, 2019). There is an underlying implicit constraint in the Saha-Boltzmann plot approach.…”

Section: Calculation Of Electron Densitymentioning

confidence: 99%

Influence of Laser Energies on Tin Oxide Nanoparticles Plasma Parameters Prepared by Nd:YAG Laser

Khalaf¹,

Hmood²

2020

SJKFU

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In this study, plasma was generated from laser-induced plasma and the parameters of the plasma were analysed using the optical emission spectroscopy technique. A 1064 nm wavelength Nd:YAG laser with a frequency of 6 Hz within a 9 ns timeframe, was used. The ratio between two spectral lines was used to calculate the temperature of the electron (T e), while the Saha-Boltzmann method was used to find the density of electrons (n e) for wavelengths between 170-670 nm, by changing the laser energies within the 400-900 mJ region. The remaining plasma parameters were also calculated. These included the Debye length ( D), the plasma frequency (ω p) and the number of atoms within the Debye sphere (N D). Three relationship diagrams illustrate the relationship between laser energy change and the plasma parameter collection. The highest possible electron temperature is 1.453 eV, while the lowest possible temperature is 1.216 eV. The upper limit of the electron density has reached 6.5 × 10 18 cm-3 , and its lowest value is 1.7 × 10 18 cm-3 .

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Determination of excitation temperature in laser-induced plasmas using columnar density Saha-Boltzmann plot

Abstract: Graphical abstract

Cited by 36 publications

References 40 publications

Gold Nanoparticle-Enhanced Laser-Induced Breakdown Spectroscopy and Three-Dimensional Contour Imaging of an Aluminum Alloy

Gold Nanoparticle-Enhanced Laser-Induced Breakdown Spectroscopy and Three-Dimensional Contour Imaging of an Aluminum Alloy

Use of laser-induced break spectroscopy for the determination of major and trace elements in Zanthoxylum armatum

Influence of Laser Energies on Tin Oxide Nanoparticles Plasma Parameters Prepared by Nd:YAG Laser

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