Progress in spectral line shapes and shifts evaluation of experimental Stark broadening parameters

1999 ◽  
Author(s):  
A. Lesage ◽  
N. Konjevic ◽  
J. R. Fuhr
Keyword(s):  
Spectral Line ◽  
Stark Broadening ◽  
Line Shapes ◽  
And Shifts

scholarly journals The influence of Stark broadening on Cr II spectral line shapes in stellar atmospheres

2007 ◽  
Vol 469 (2) ◽  
pp. 681-686 ◽  
Author(s):  
M. S. Dimitrijević ◽  
T. Ryabchikova ◽  
Z. Simić ◽  
L. Č. Popović ◽  
M. Dačić
Keyword(s):  
Spectral Line ◽  
Stellar Atmospheres ◽  
Stark Broadening ◽  
Line Shapes

scholarly journals Relation between Theories, Experiments, and Simulations of Spectral Line Shapes

2010 ◽  
Vol 2010 ◽  
pp. 1-4
Author(s):  
Eugene Oks
Keyword(s):  
Spectral Line ◽  
Numerical Simulations ◽  
Research Methodology ◽  
Spectral Lines ◽  
Experimental Science ◽  
Line Shapes ◽  
The Third ◽  
Physical Insight ◽  
And Shifts ◽  
Comparison With Experiments

Simulations of Shapes and Shifts of Spectral Lines (SSSL) are important as the third powerful research methodology—in addition to theories and experiments. However, there is a growing tendency in physics in general and in the area of SSSL in particular, to consider the ultimate test of any theory to be the comparison with results of a code based on fully-numerical simulations starting from the “scratch” rather than from some analytical advance. In this paper, we show by examples that fully-numerical simulations are often not properly verified and validated, fail to capture emergent principles and phenomena, and lack the physical insight. Physics is the experimental science. So, the ultimate test of any theory—including theories of SSSL—should be the comparison with experiments conducted in well-controlled conditions (benchmark experiments).

Testing the Planet Hypothesis: A Search for Variability in the Spectral‐Line Shapes of 51 Pegasi

1997 ◽  
Vol 478 (1) ◽  
pp. 374-380 ◽  
Author(s):  
Artie P. Hatzes ◽  
William D. Cochran ◽  
Christopher M. Johns‐Krull
Keyword(s):  
Spectral Line ◽  
Line Shapes

scholarly journals From the Vector to Scalar Perturbations Addition in the Stark Broadening Theory of Spectral Lines

Universe ◽  
2021 ◽  
Vol 7 (6) ◽  
pp. 176
Author(s):  
Valery Astapenko ◽  
Andrei Letunov ◽  
Valery Lisitsa
Keyword(s):  
Spectral Line ◽  
Stark Effect ◽  
Coulomb Field ◽  
Spectral Lines ◽  
Alternative Methods ◽  
Scalar Perturbation ◽  
Numerical Comparison ◽  
Line Shapes ◽  
Stark Effects ◽  
The Impact

The effect of plasma Coulomb microfied dynamics on spectral line shapes is under consideration. The analytical solution of the problem is unachievable with famous Chandrasekhar–Von-Neumann results up to the present time. The alternative methods are connected with modeling of a real ion Coulomb field dynamics by approximate models. One of the most accurate theories of ions dynamics effect on line shapes in plasmas is the Frequency Fluctuation Model (FFM) tested by the comparison with plasma microfield numerical simulations. The goal of the present paper is to make a detailed comparison of the FFM results with analytical ones for the linear and quadratic Stark effects in different limiting cases. The main problem is connected with perturbation additions laws known to be vector for small particle velocities (static line shapes) and scalar for large velocities (the impact limit). The general solutions for line shapes known in the frame of scalar perturbation additions are used to test the FFM procedure. The difference between “scalar” and “vector” models is demonstrated both for linear and quadratic Stark effects. It is shown that correct transition from static to impact limits for linear Stark-effect needs in account of the dependence of electric field jumping frequency in FFM on the field strengths. However, the constant jumping frequency is quite satisfactory for description of the quadratic Stark-effect. The detailed numerical comparison for spectral line shapes in the frame of both scalar and vector perturbation additions with and without jumping frequency field dependence for the linear and quadratic Stark effects is presented.

scholarly journals Special Issue on Spectral Line Shapes in Plasmas

Atoms ◽  
2014 ◽  
Vol 2 (3) ◽  
pp. 378-381 ◽  
Author(s):  
Evgeny Stambulchik ◽  
Annette Calisti ◽  
Hyun-Kyung Chung ◽  
Manuel González
Keyword(s):  
Spectral Line ◽  
Special Issue ◽  
Line Shapes

scholarly journals Measuring the supermassive black hole parameters with space missions

2006 ◽  
Vol 2 (S238) ◽  
pp. 475-476
Author(s):  
Alexander F. Zakharov
Keyword(s):  
Black Hole ◽  
Spectral Line ◽  
Accretion Disks ◽  
Seyfert Galaxies ◽  
Emission Lines ◽  
X Ray ◽  
Line Shapes ◽  
Supermassive Black Hole ◽  
Broad Emission ◽  
Different Types

AbstractRecent X-ray observations of microquasars and Seyfert galaxies reveal broad emission lines in their spectra, which can arise in the innermost parts of accretion disks. Recently Müller & Camenzind (2004) classified different types of spectral line shapes and described their origin. Zakharov (2006b) clarified their conclusions about an origin of doubled peaked and double horned line shapes in the framework of a radiating annulus model and discussed s possibility to evaluate black hole parameters analyzing spectral line shapes.

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