scholarly journals Comparisons and Comments on Electron and Ion Impact Profiles of Spectral Lines

2011 ◽  
Vol 20 (4) ◽  
Author(s):  
Sylvie Sahal-Bréchot ◽  
Milan S. Dimitrijević ◽  
Nebil Ben Nessib
Keyword(s):  
Neutral Atom ◽  
Molecular Data ◽  
Stellar Atmospheres ◽  
Spectral Lines ◽  
Stark Broadening ◽  
Spectroscopic Diagnostics ◽  
Data Centre ◽  
Ion Impact ◽  
And Shifts ◽  
The Impact

AbstractStark broadening theory is currently operated for calculating widths and shifts of spectral lines that are needed for spectroscopic diagnostics and modeling in astrophysics, laboratory and technological plasmas. We have calculated a great number of data, obtained through the impact semiclassical perturbation theory: tables have been published for neutral atom and ion emitters, and typical temperatures, electron and ion densities. They are currently implemented in the STARK-B database which participates in the European effort within the Virtual Atomic and Molecular Data Centre. Despite of that, a great number of data are still missing. In the present paper, we revisit and compare a great number of the impact Stark widths and shifts by considering their semiclassical perturbation expressions. We also provide fitting formulae which are essential for the modeling codes of stellar atmospheres and envelopes.

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 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.

scholarly journals Stark Broadening of Several Ne II, Ne III and O III Spectral Lines for the Stark-B Database

2011 ◽  
Vol 20 (4) ◽  
Author(s):  
Milan S. Dimitrijević ◽  
Andjelka Kovačević ◽  
Zoran Simić ◽  
Sylvie Sahal-Bréchot
Keyword(s):  
Data Center ◽  
Molecular Data ◽  
Stellar Atmospheres ◽  
Spectral Lines ◽  
Stark Broadening ◽  
Visible Part

AbstractIn order to complete Stark broadening data for Ne II and O III lines, needed for analysis of stellar atmospheres, we determined the missing parameters for the broadening by collisions with protons and ionized helium for 15 Ne II and 5 O III multiplets. Also, electron, proton and ionized helium impact broadening parameters for an important Ne II multiplet in the visible part of the spectrum and for three Ne III multiplets were calculated. The obtained data will be included in the STARK-B database, which is a part of the Virtual Atomic and Molecular Data Center.

scholarly journals Stark broadening parameter tables for Ne II and Ne III spectral lines

2001 ◽  
pp. 57-70 ◽  
Author(s):  
M.S. Dimitrijevic
Keyword(s):  
Stellar Atmospheres ◽  
Spectral Lines ◽  
Stark Broadening ◽  
Semiclassical Approach ◽  
Line Widths ◽  
And Shifts

Using a semiclassical approach, we have calculated electron-, proton-, He II-, Mg II-, Si II- and Fe II-impact line widths and shifts for 10 Ne II and 6 Ne III multiplets as a function of temperature and perturber density. For Ne II temperatures are: 5,000 K; 10,000 K; 20,000 K; 30,000 K; 50,000 K and 100,000 K and perturber densities from 1015 cm-3 up to 1020 cm-3. For Ne III temperatures are: 20,000 K; 50,000 K; 100,000 K; 200,000 K; 300,000 K and 500,000 K and perturber densities from 1017 cm-3 up to 1021 cm-3. Perturbers selected here, are the main perturbers in solar and stellar atmospheres.

scholarly journals Stark broadening parameter tables for neutral calcium spectral lines. I

1999 ◽  
pp. 35-74 ◽  
Author(s):  
M.S. Dimitrijevic ◽  
S. Sahal−Bréchot
Keyword(s):  
Stellar Atmospheres ◽  
Spectral Lines ◽  
Stark Broadening ◽  
Semiclassical Approach ◽  
Line Widths ◽  
And Shifts

Using a semiclassical approach, we have calculated electron?, proton?, He II?, Mg II-, Si II- and Fe II-impact line widths and shifts for 189 Ca I multiplets as a function of temperature. Perturbers selected here, are the main perturbers in solar and stellar atmospheres.

Approximate Classical Trajectories and the Adiabatic Theory of the Stark Broadening of Neutral-Atom Lines

1979 ◽  
Vol 34 (11) ◽  
pp. 1362-1364 ◽  
Author(s):  
M. S. Dimitrijević ◽  
P. Grujić
Keyword(s):  
Low Temperatures ◽  
Neutral Atom ◽  
Temperature Limit ◽  
Back Reaction ◽  
Stark Broadening ◽  
Collision Time ◽  
Adiabatic Theory ◽  
Classical Trajectories ◽  
Definition Of ◽  
The Impact

At low temperatures the effect of back reaction of the neutral emitter on a perturbing electron may become noticeable and consequently deviations of the electron motion from the uniform one should be taken into account. In this note we discuss some consequences of an inclusion of the curvilinear trajectories on the impact Stark broadening theory in the low temperature limit. In particular we consider a proposed improvement of the commonly used definition of the collision time, in the case of the repulsive electron-excited neutral interaction

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 Stark broadening of resonant Cr II 3d5–3d44p spectral lines in hot stellar atmospheres

2013 ◽  
Vol 432 (3) ◽  
pp. 2247-2251 ◽  
Author(s):  
Z. Simić ◽  
M. S. Dimitrijević ◽  
S. Sahal-Bréchot
Keyword(s):  
Stellar Atmospheres ◽  
Spectral Lines ◽  
Stark Broadening

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.

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