scholarly journals ON THE STARK BROADENING OF Os II SPECTRAL LINES

2020 ◽  
Vol 10 (2) ◽  
Author(s):  
Milan S. Dimitrijević
Keyword(s):  
Electron Density ◽  
Spectral Lines ◽  
Half Maximum ◽  
Stark Broadening ◽  
Plasma Parameters ◽  
And Shifts

Stark broadening parameters, full widths at half maximum (FWHM) and shifts for 13 Os II lines have been calculated. The plasma parameters are: electron density of 1017 cm-3 and temperatures from 5 000 K to 80 000 K. Calculations have been performed with the simplified modified semiempirical (SMSE) approach. The results are also used for the consideration of Strak width and shift regularities within the Os II 6s6D-6p6Do multiplet.

scholarly journals On the stark broadening of Os II spectral lines

2020 ◽  
Vol 10 (2) ◽  
pp. 65-70
Author(s):  
Milan Dimitrijević
Keyword(s):  
Electron Density ◽  
Spectral Lines ◽  
Half Maximum ◽  
Stark Broadening ◽  
Plasma Parameters ◽  
And Shifts

Stark broadening parameters, full widths at half maximum (FWHM) and shifts for 13 Os II lines have been calculated. The plasma parameters are: electron density of 1017 cm-3 and temperatures from 5 000 K to 80 000 K. Calculations have been performed with the simplified modified semiempirical (SMSE) approach. The results are also used for the consideration of Strak width and shift regularities within the Os II 6s6D-6p6Do multiplet.

scholarly journals ON THE STARK BROADENING OF Ru III SPECTRAL LINES

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Milan S. Dimitrijević
Keyword(s):  
Electron Density ◽  
Semiempirical Method ◽  
Spectral Lines ◽  
Half Maximum ◽  
Stark Broadening ◽  
Temperature Range ◽  
And Shifts ◽  
Doubly Charged ◽  
Stark Width

Stark broadening parameters, full widths at half maximum (FWHM) and shifts for spectral lines within six multiplets of doubly charged ruthenium ions have been calculated, for an electron density of 1017 cm-3 and temperature range from 10 000 K to 160 000 K. Calculations have been performed with the simplified modified semiempirical (SMSE) approach. In the case of two multiplets, it is possible to apply the full modified semiempirical method. The corresponding calculations have been performed and results are compared in order to test and determine the accuracy of the SMSE approach. The results are also used for the consideration of Stark width and shift regularities in Ru III spectrum.

EXPRESS: Feasibility of Using Boltzmann Plots to Evaluate the Stark Broadening Parameters of Cu(I) Lines

2021 ◽  
pp. 000370282110133
Author(s):  
Mohamed Fikry ◽  
Ibraheem A. Alhijry ◽  
A. M. Aboulfotouh ◽  
Ashraf M. EL Sherbini
Keyword(s):  
Electron Density ◽  
Missing Values ◽  
Pure Copper ◽  
Spectral Lines ◽  
Stark Broadening ◽  
Air Plasma ◽  
Plasma Parameters ◽  
Boltzmann Plot ◽  
Copper Target ◽  
Delay Times

A linear Boltzmann plot was constructed using Cu I-lines of well-known atomic parameters. Aligning other spectral lines to the plot was adopted as a viable way to estimate the most probable values of Stark broadening parameters of Cu I-lines at 330.79, 359.91, and 360.2 nm. Plasma was generated by focusing of Nd: YAG laser radiation at wavelength 532 nm on a pure copper target in open air. Plasma emission was recorded at delay times of 3, 4, 5, 7, and 10 μs. The in situ optically thin H<sub>α</sub>-line was used to determine the plasma reference electron density over the entire experiment. Following this method, the missing values of the Stark broadening parameters of the three Cu-I lines turn out to be about 0.15 ± 0.05 Å (for 330.79 nm transition) and 0.17 ± 0.05 Å (for 359.91, and 360.20 nm transition) at reference electron density of (1 ± 0.09)×10<sup>17</sup> cm<sup>-3</sup> and temperature of 10800 ± 630 K. The apparent variation in plasma parameters at different delay times was found to scale with electron density and temperature as <i>~ n<sub>e</sub>.T<sub>e</sub><sup>0.166</sup></i>.

scholarly journals Experimental stark widths and shifts of V II spectral lines

2020 ◽  
Vol 498 (2) ◽  
pp. 2068-2074 ◽  
Author(s):  
J Manrique ◽  
D M Díaz Pace ◽  
C Aragón ◽  
J A Aguilera
Keyword(s):  
Electron Density ◽  
Wavelength Range ◽  
Spectral Lines ◽  
Electron Density And Temperature ◽  
And Shifts

ABSTRACT We have measured the Stark widths and shifts of V II spectral lines in the wavelength range 2000–4200 Å belonging to 75 multiplets. The spectra are emitted by laser-induced plasmas generated from fused glass discs prepared by borate fusion. The electron density and temperature are in the ranges (0.72–6.5) × 1017 cm−3 and (11 000–14 900) K, respectively. To avoid self-absorption, we have used seven samples with vanadium concentrations selected by the CSigma graph methodology. This has allowed to include strong and weak lines in the study, including resonance and forbidden lines. The experimental widths and shifts are compared with theoretical values available in the literature.

scholarly journals The effect of hyperfine splitting on Stark broadening for three blue-green Cu i lines in laser-induced plasma

2019 ◽  
Vol 488 (4) ◽  
pp. 5594-5603 ◽  
Author(s):  
A M Popov ◽  
N I Sushkov ◽  
S M Zaytsev ◽  
T A Labutin
Keyword(s):  
Hyperfine Splitting ◽  
Stark Effect ◽  
Stellar Atmospheres ◽  
Spectral Lines ◽  
Stark Broadening ◽  
Laser Induced Plasma ◽  
Radiation Sources ◽  
And Shifts ◽  
First Time ◽  
Existing Data

ABSTRACT Stark effect is observed in many natural and artificial plasmas and is of great importance for diagnostic purposes. Since this effect alters profiles of spectral lines, it should be taken into account when assessing chemical composition of radiation sources, including stars. Copper is one of the elements which studies of stellar atmospheres deal with. To this end, UV and visible Cu lines are used. However, there is a lack of agreement between existing data on their Stark parameters. It is therefore of interest to obtain new experimental data on these lines and to compare them to previous results. In this work, we have estimated Stark widths and shifts for three blue-green lines at 5105.54, 5153.24, and 5218.20 Å (corresponding transitions are [3d104p] 2P° → [3d94s2] 2D and [3d104d] 2D → [3d104p] 2P°) observed in a ‘long-spark’ laser-induced plasma. For the first time, we have accurately estimated an impact of hyperfine splitting on the profile shapes of the studied lines taking also into account the isotope shifts. We have shown that both effects considerably influence shift and width of Cu i line at 5105.54 Å, and shifts of Cu i lines at 5153.24 and 5218.20 Å.

scholarly journals Measurement of Laser-Induced Plasma: Stark Broadening Parameters of Pb(II) 2203.5 and 4386.5 Å Spectral Lines

2019 ◽  
Vol 73 (2) ◽  
pp. 133-151 ◽  
Author(s):  
Aurelia Alonso-Medina
Keyword(s):  
Yttrium Aluminum Garnet ◽  
Electron Number Density ◽  
Graphical Representation ◽  
Spectral Lines ◽  
Stark Broadening ◽  
Number Density ◽  
Electron Number ◽  
Breakdown Spectroscopy ◽  
Fundamental Wavelength ◽  
And Shifts

In this work, the Stark broadening parameters (widths and shifts) of the 2203.5 Å and 4386.5 Å Pb(II) spectral lines have been investigated and measured in laser-induced breakdown spectroscopy (LIBS), using a lead sample (99.999% purity). A Q-switched neodymium-doped yttrium aluminum garnet (Nd:YAG) laser operating at its fundamental wavelength (10 640 Å), generating pulses of 290 mJ, 7 ns of duration, and a repeat frequency of 20 Hz, has been used for the ablation of said lead sample in vacuum and in a controlled argon atmosphere. A study to understand the expansion dynamics of the lead produced plasma was performed. The spectra have been obtained and measured at different time delays of the plasma evolution in the range of 0.15–9 μs, at which the temperature and electron number density are in the ranges of 28 200–8000 K and 1.3 × 1017 to 3 × 1015 cm−3, respectively. A graphical representation of the evolution of temperature and electron number density versus 0.3 to 6.5 μs delay from the laser pulse is presented. The important effect of the different environment where the plasma expands has been pointed out. Local thermodynamic equilibrium conditions have been checked. The obtained results of the Stark widths and shifts at the different temperatures and densities of electrons have been compared with the limited data available in the literature. This study aims to obtain more accurate values for these parameters and also to establish regularities and similarities for said parameters.

scholarly journals Spectroscopic analysis of magnesium-aluminum alloys by laser induced breakdown spectroscopy

2018 ◽  
Vol 16 (36) ◽  
pp. 113-122
Author(s):  
Ali A-K. Hussain
Keyword(s):  
Electron Temperature ◽  
Electron Density ◽  
Spectral Lines ◽  
Molar Ratio ◽  
Stark Broadening ◽  
Boltzmann Plot ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Electron Density Increase ◽  
Atomic Lines

In this work, the spectra of plasma glow produced by Nd:YAG laser operated at 1.064 μm on Al-Mg alloys with same molar ratio samples in air were analyzed by comparing the atomic lines of aluminum and magnesium with that of strong standard lines. The effect of laser energies on spectral lines, produced by laser ablation, were investigated using optical spectroscopy, the electron density was measured utilizing the Stark broadening of magnesium-aluminum lines and the electron temperature was calculated from the standard Boltzmann plot method. The results that show the electron temperature increases in magnesium and aluminum targets but decreases in magnesium: aluminum alloy target, also show the electron density increase all the aluminum, magnesium and mix both them, It was found that the lines intensities at different laser peak powers increase when the laser peak power increases then decreases when the power continues to increase.

scholarly journals INFLUENCE OF LONGITUDINAL MAGNETIC FIELD IN THE MPC CHANNEL ON THE DENSITY OF GENERATED PLASMA STREAM

2021 ◽  
pp. 57-60
Author(s):  
A.K. Marchenko ◽  
O.V. Byrka ◽  
V.A. Makhlai ◽  
S.S. Herashenko ◽  
D.G. Solyakov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Density ◽  
Axial Magnetic Field ◽  
Plasma Electron ◽  
Spectral Lines ◽  
Plasma Stream ◽  
Stark Broadening ◽  
Density Distributions ◽  
Average Electron ◽  
Field Influence

The paper is devoted to experimental measurements and analysis of parameters of the plasma streams generated by magnetoplasma compressor (MPC) upgraded with an external axial magnetic field. Influence of the external axial magnetic field of 0.24 T on helium plasma streams (P=2 Torr) has been studied. The measurements of average electron density distributions were performedboth with and without an external axial B-field. Distributions of plasma electron density Ne (L) were measured with spectroscopy in the plasma stream and in the compression zone using Stark broadening of He I and He II spectral lines. Plasma-surface interaction processes were also analyzed.

Effect of Current on Plasma Parameters Resulting from the Wires-Exploding Technique of Copper Material

2020 ◽  
pp. 110-113
Keyword(s):  
Electron Temperature ◽  
Electron Density ◽  
Optical Emission ◽  
Plasma Electron ◽  
Stark Broadening ◽  
Number Density ◽  
Hydrogen Atoms ◽  
Plasma Parameters ◽  
Optical Emission Spectrum ◽  
Copper Material

In this research the diagnostic of optical emission spectroscopy from exploding copper wires have done for different current. By using Boltzman plot can be calculated the plasma electron temperature , and by using Stark broadening can be evaluated the electron density for different current of (75, 100 and 150)A with diameter 0.25 mm in deionized water. It was observed that the electron density decrease with an increasing the current from 75 A to 150 A while the electron temperatures increase for the same current. The plasma has a peak 652 nm corresponding to Hα line for .hydrogen .atoms which obtained from .optical emission spectrum (OES), the peaks belong to atomic copper lines. The plasma electron temperature related with emission line intensity and number .density with the formed copper nanoparticles size was studied.

scholarly journals Stark Broadening of Several Ar I Spectral Lines in the Visible Spectrum

2011 ◽  
Vol 20 (4) ◽  
Author(s):  
Milan S. Dimitrijević ◽  
Andjelka Kovačević ◽  
Zoran Simić ◽  
Sylvie Sahal-Bréchot
Keyword(s):  
Perturbation Theory ◽  
Data Center ◽  
Visible Spectrum ◽  
Molecular Data ◽  
Complete Data ◽  
Spectral Lines ◽  
Stark Broadening ◽  
And Shifts

AbstractIn order to complete data on Stark broadening parameters for Ar I line in the visible spectrum, we determined Stark widths and shifts due to electron, proton and ionized helium impacts for nine lines (4191.0, 4259.4, 5912.1, 6043.2, 6045.0, 6752.9, 7503.9, 7514.6, 7724.2 Å), using jK coupling and semiclassical perturbation theory. The obtained results will enter the STARK-B database, which is a part of the Virtual Atomic and Molecular Data Center.

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