Characterizing Laser-induced Plasma Generated from MgO/PVA Solid Targets

Hamad, Tagreed K.; Jasim, Aseel S.; Salloom, Hussein T.

doi:10.1134/s0030400x19070099

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…It can be seen that there is a significant enhancement in the intensity of all identified lines as laser peak power increased from 50 to 200 mJ, due to higher mass ablation rate from the target and higher number of excited atoms leading to increased peak intensity of the emission lines. However, this increase is addressed by other related works [20,25] and suffers from saturation effect, especially at thick optical plasma due to plasma shielding [26].…”

Section: Optimization Of Libs Spectramentioning

confidence: 93%

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Investigation of compositional analysis and physical properties for Ni-Cr-Nb alloys using laser-induced breakdown spectroscopy

Salloom¹,

Hamad²

2021

Optica Applicata

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In this work, laser-induced breakdown spectroscopy (LIBS) analysis is optimized for direct estimation of elemental composition, thermal conductivity and hardness for Ni-Cr-Nb alloys. These alloys were chosen with a variable elemental content of niobium and chromium. The influence of laser energy and shot numbers on measuring line intensity was investigated. Based on the ratio between two spectral lines, calibration curves were formed to estimate the element concentration and LIBS results were confirmed with related energy-dispersive X-ray spectroscopy (EDS) data. Hardness and thermal conductivity estimation using LIBS were done by measuring the ratio between two spectral lines, plasma excitation temperature and electron density for different samples. Semi-empirical formulas correlated hardness and thermal conductivity with plasma temperature were established.

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Section: Optimization Of Libs Spectramentioning

confidence: 93%

“…For calculation of T e , Eq. ( 2) requisites rearrange to establish the Boltzmann plot as given in the following expression [20]:…”

Section: Libs Theory and Principlementioning

confidence: 99%

Investigation of compositional analysis and physical properties for Ni-Cr-Nb alloys using laser-induced breakdown spectroscopy

Salloom¹,

Hamad²

2021

Optica Applicata

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“…By plotting ln ( the top kinetic energy of free plasma electrons. This is because plasma may absorb laser photons while still enabling the laser beam to travel through it [11]. When electrons and relatively slow-moving ions combine to affect the ions or atoms in the plasma, electrical fields are formed.…”

Section: Characterization Of Laser Induced Zn Plasmamentioning

confidence: 99%

Spectroscopic Diagnostic of Laser-Induced Zn Plasma

Magid,

Waleed Jabbar Mhana,

Hanaa Salih Sabaa

2023

IHJPAS

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The sample's physical characteristics and laser parameters impact the generation and characterization of Laser-Induced Plasma (LIP), which is a relevant phenomenon in many applications. We investigated the effect of laser energy on laser-induced Zn plasma characterization in this study. A Zn plasma with a repeating frequency of 6 Hz, a first wavelength of 1064 nm, a pulse duration of 10 ns, and a laser energy range of 300 mJ to 500 mJ was created using a Q-switched ND: YAG laser. The basic plasma properties, such as electron temperature and density, were estimated using optical emission spectroscopy (OES). The electrons' temperature was measured by the Boltzmann plot method, and the value of the electrons' temperature ranged from 1.6 eV to 2.051 eV in the laser energy range (300-500) mJ. In electron density estimation using the Stark broadening methods, the density value range from 12.75×1017 cm-3 to 19.50×1017 cm-3, in laser energy range (300-500 ) mJ. In addition, various plasma characteristics such as plasma frequency (fp), the number of particles in the Debye sphere (ND), and Debye length (λD) were estimated. We found that laser energy affects every plasma parameter.

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“…The intensity of the LIBS signal increased as the laser intensity increased at a laser irradiance range of 2.1 to 4.8×10 8 (W/cm 2 ), as shown in Figure 2. As laser irradiance increases, the plasma's absorption of laser light increases, leading to an increase in ablation rate and a rise in spectral line intensity [8]. The Zn plasma spectra covered the region from 250 to 700 nm, including the emission of 9 spectral lines upon excitation by the 1064 nm wavelength at different laser irradiance.…”

Section: Spectroscopy Diagnosticsmentioning

confidence: 99%

“…The condition that determines the critical electron density required to achieve McWhirter criterion is [11]: ⁄ ( ) Where: T e and N e are the temperature and density of the electron, respectively, ΔE is the energy gap between the upper and lower energy levels of the corresponding spectral line. Due to the relatively high electron density, N e ≥10 16 (cm -3 ) [8], it was assumed that the plasma is in a state of local thermal equilibrium (LTE) and that the species distribution has a Boltzmann form. In our study, the maximum value of electron temperature was 6138 K, and the energy difference between the top and the bottom level was 2.518 eV.…”

Section: The Verification Of Local Thermodynamic Equilibrium (Lte)mentioning

confidence: 99%

Spectroscopy Diagnostic of Laser Intensity Effect on Zn Plasma Parameters Generated by Nd: YAG Laser

Mohammed

Aadim

Ahmed

2022

eijs

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The creation and characterization of laser-generated plasma are affected by laser irradiance, representing significant phenomena in many applications. The present work studied the spectroscopy diagnostic of laser irradiance effect on Zn plasma features created in the air by a Q-switched Nd: YAG laser at the fundamental wavelength (1064nm). The major plasma parameters (electron temperature and electron density) have been measured using the Boltzmann plot and the Stark broadening methods. The value of electrons temperature ranged from 6138–6067 K, and the electron density in the range of 1.4×1018 to 2×1018 cm-3, for laser irradiance range from 2.1 to 4.8×108 (W/cm2). The McWhirter criterion for preserving a local thermodynamic equilibrium (LTE) condition is confirmed in this study. Furthermore, other fundamental plasma parameters, such as Debye length (λD), number of particles in Debye sphere (ND), and plasma frequency (ωp), were measured. We found that all plasma parameters are affected by laser intensity.

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Characterizing Laser-induced Plasma Generated from MgO/PVA Solid Targets

Cited by 7 publications

References 12 publications

Investigation of compositional analysis and physical properties for Ni-Cr-Nb alloys using laser-induced breakdown spectroscopy

Investigation of compositional analysis and physical properties for Ni-Cr-Nb alloys using laser-induced breakdown spectroscopy

Spectroscopic Diagnostic of Laser-Induced Zn Plasma

Spectroscopy Diagnostic of Laser Intensity Effect on Zn Plasma Parameters Generated by Nd: YAG Laser

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