scholarly journals On the applications of the modified semiempirical method for Stark broadening: the example of the alkali-like ion Sr II

2021 ◽  
Vol 75 (3) ◽  
Author(s):  
Abeer Almodlej ◽  
Najah Alwadie ◽  
Nabil Ben Nessib ◽  
Milan S. Dimitrijević
Keyword(s):  
Semiempirical Method ◽  
Stark Broadening

scholarly journals Forty Years of the Applications of Stark Broadening Data Determined with the Modified Semiempirical Method

Data ◽  
2020 ◽  
Vol 5 (3) ◽  
pp. 73
Author(s):  
Milan S. Dimitrijević
Keyword(s):  
Semiempirical Method ◽  
Radiative Properties ◽  
Stark Broadening ◽  
B Stars ◽  
Design And Optimization ◽  
Research Fields ◽  
Ablation Laser ◽  
Laser Design ◽  
Future Work

The aim of this paper is to analyze the various uses of Stark broadening data for non-hydrogenic lines emitted from plasma, obtained with the modified semiempirical method formulated 40 years ago (1980), which are continuously implemented in the STARK-B database. In such a way one can identify research fields where they are applied and better see the needs of users in order to better plan future work. This is done by analysis of citations of the modified semiempirical method and the corresponding data in international scientific journals, excluding cases when they are used for comparison with other experimental or theoretical Stark broadening data or for development of the theory of Stark broadening. On the basis of our analysis, one can conclude that the principal applications of such data are in astronomy (white dwarfs, A and B stars, and opacity), investigations of laser produced plasmas, laser design and optimization and their applications in industry and technology (ablation, laser melting, deposition, plasma during electrolytic oxidation, laser micro sintering), as well as for the determination of radiative properties of various plasmas, plasma diagnostics, and investigations of regularities and systematic trends of Stark broadening parameters.

scholarly journals Stark Widths of Yb III and Lu IV Spectral Lines

Atoms ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 10
Author(s):  
Milan Dimitrijević
Keyword(s):  
Experimental Data ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Data Center ◽  
Semiempirical Method ◽  
Molecular Data ◽  
Stellar Atmosphere ◽  
Spectral Lines ◽  
Stark Broadening ◽  
Isoelectronic Sequence

Rare Earth Elements are important for stellar atmosphere analysis but the corresponding Stark broadening data are scarce. For Yb III and Lu IV theoretical as well as experimental data on Stark broadening parameters of spectral lines are absent in the literature. Using the modified semiempirical method of Dimitrijević and Konjević, we determined Stark widths for four Yb III and four Lu IV transitions, belonging to the erbium isoelectronic sequence. The obtained results are also used to discuss similarities between homologous transitions in the erbium isoelectronic sequence. We note as well that calculated widths will be implemented in the STARK-B database which is also a part of the Virtual Atomic and Molecular Data Center.

scholarly journals Stark Broadening of Co II Lines in Stellar Atmospheres

Data ◽  
2020 ◽  
Vol 5 (3) ◽  
pp. 74
Author(s):  
Zlatko Majlinger ◽  
Milan S. Dimitrijević ◽  
Vladimir A. Srećković
Keyword(s):  
Spectral Line ◽  
Effective Temperature ◽  
White Dwarf ◽  
Semiempirical Method ◽  
Stellar Atmospheres ◽  
Spectral Lines ◽  
Surface Gravity ◽  
Type Star ◽  
Half Maximum ◽  
Stark Broadening

Data for Stark full widths at half maximum for 46 Co II multiplets were calculated using a modified semiempirical method. In order to show the applicability and usefulness of this set of data for research into white dwarf and A type star atmospheres, the obtained results were used to investigate the significance of the Stark broadening mechanism for Co II lines in the atmospheres of these objects. We examined the influence of surface gravity (log g), effective temperature and the wavelength of the spectral line on the importance of the inclusion of Stark broadening contribution in the profiles of the considered Co II spectral lines, for plasma conditions in atmospheric layers corresponding to different optical depths.

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.

Influence of solvent polarity on the dual fluorescence of p-N,N-dimethylaminobenzonitrile: An AM1 theoretical study

1990 ◽  
Vol 55 (8) ◽  
pp. 1891-1895 ◽  
Author(s):  
Peter Ertl
Keyword(s):  
Excited State ◽  
Theoretical Study ◽  
Solvent Polarity ◽  
Semiempirical Method ◽  
Dual Fluorescence ◽  
Long Wavelength ◽  
Polar Media ◽  
Wavelength Emission ◽  
Ground State Geometry ◽  
Influence Of Solvent

Twisting of the NMe2 group in p-N,N-dimethylaminobenzonitrile (DMABN) was investigated using AM1 semiempirical method with configuration interaction. Effect of polar media was considered by placing + and - charge centers ("sparkles") at appropriate places opposite the molecule. Optimized ground state geometry of DMABN is slightly twisted with the lowest vertical excited state of 1B character. As the polarity of media increases and/or the - NMe2 group twists, the symmetric 1A excited state having considerable charge separation becomes energetically favorable. Anomalous long-wavelength emission of DMABN comes from this state.

scholarly journals The Semiclassical Limit of the Gailitis Formula Applied to Electron Impact Broadening of Spectral Lines of Ionized Atoms

Atoms ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 29
Author(s):  
Sylvie Sahal-Bréchot
Keyword(s):  
Electron Impact ◽  
Classical Limit ◽  
Semiclassical Limit ◽  
Spectral Lines ◽  
Stark Broadening ◽  
Feshbach Resonances

The present paper revisits the determination of the semi-classical limit of the Feshbach resonances which play a role in electron impact broadening (the so-called “Stark“ broadening) of isolated spectral lines of ionized atoms. The Gailitis approximation will be used. A few examples of results will be provided, showing the importance of the role of the Feshbach resonances.

Stark broadening measurement of the line 2058.13 nm of neutral helium in a linear discharge

1989 ◽  
Vol 42 (1) ◽  
pp. 39-43 ◽  
Author(s):  
Y. Guimeráns ◽  
E.J. Iglesias ◽  
D. Mandelbaum ◽  
A. Sánchez
Keyword(s):  
Stark Broadening
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