Quasicontiguous frequency-fluctuation model for calculation of hydrogen and hydrogenlike Stark-broadened line shapes in plasmas

2013 ◽  
Vol 87 (5) ◽  
Author(s):  
E. Stambulchik ◽  
Y. Maron
Keyword(s):  
Frequency Fluctuation ◽  
Line Shapes ◽  
Fluctuation Model

Frequency-fluctuation model applied to Stark-Zeeman spectral line shapes in plasmas

2011 ◽  
Vol 84 (2) ◽  
Author(s):  
S. Ferri ◽  
A. Calisti ◽  
C. Mossé ◽  
L. Mouret ◽  
B. Talin ◽  
...  
Keyword(s):  
Spectral Line ◽  
Frequency Fluctuation ◽  
Line Shapes ◽  
Fluctuation Model

scholarly journals The Frequency Fluctuation Model for the van der Waals Broadening

2021 ◽  
Author(s):  
Andrei Letunov ◽  
Valery Lisitsa ◽  
Valery Astapenko
Keyword(s):  
Experimental Data ◽  
Spectral Line ◽  
Line Shape ◽  
Frequency Fluctuation ◽  
Neutral Particles ◽  
Line Shapes ◽  
First Time ◽  
Analytical Expressions ◽  
Fluctuation Model ◽  
Good Agreement

The effect of atomic and molecular microfied dynamics on spectral line shapes is under consideration. This problem is treated in the framework of the Frequency Fluctuation Model (FFM). For the first time the FFM is tested for the broadening of a spectral line by neutral particles. The usage of the FFM allows one to derive simple analytical expressions and perform fast calculations of the intensity profile. The obtained results was compared with Chen and Takeo theory (CT), which is in a good agreement with experimental data. It was demonstrated that for moderate values of temperature and density the FFM successfully describes the effect of the microfield dynamics on a spectral line shape.

Ground work supporting the codes based upon the frequency fluctuation model

1997 ◽  
Vol 58 (4-6) ◽  
pp. 953-964 ◽  
Author(s):  
B. Talin ◽  
A. Calisti ◽  
S. Ferri ◽  
M. Koubiti ◽  
T. Meftah ◽  
...  
Keyword(s):  
Frequency Fluctuation ◽  
Fluctuation Model

The frequency fluctuation model applied to the hydrogen-like helium Paschen-α line

1997 ◽  
Author(s):  
T. Meftah ◽  
S. Alexiou ◽  
A. Calisti ◽  
L. Godbert ◽  
R. Stamm ◽  
...  
Keyword(s):  
Frequency Fluctuation ◽  
Fluctuation Model

Frequency-fluctuation model for line-shape calculations in plasma spectroscopy

1995 ◽  
Vol 51 (3) ◽  
pp. 1918-1928 ◽  
Author(s):  
B. Talin ◽  
A. Calisti ◽  
L. Godbert ◽  
R. Stamm ◽  
R. W. Lee ◽  
...  
Keyword(s):  
Line Shape ◽  
Frequency Fluctuation ◽  
Plasma Spectroscopy ◽  
Fluctuation Model

Improved Frequency Fluctuation Model for Spectral Line Shape Calculations in Fusion Plasmas

2010 ◽  
Author(s):  
S. Ferri ◽  
A. Calisti ◽  
C. Mossé ◽  
B. Talin ◽  
V. Lisitsa ◽  
...  
Keyword(s):  
Spectral Line ◽  
Line Shape ◽  
Frequency Fluctuation ◽  
Fusion Plasmas ◽  
Spectral Line Shape ◽  
Fluctuation Model

Implications of Person Fluctuation for the Stability and Validity of Test Scores

Methodology ◽  
2006 ◽  
Vol 2 (4) ◽  
pp. 142-148 ◽  
Author(s):  
Pere J. Ferrando
Keyword(s):  
Item Response ◽  
Test Scores ◽  
Temporal Stability ◽  
Person Fit ◽  
Item Parameters ◽  
Individual Trait ◽  
The Stability ◽  
The Individual ◽  
Different Levels ◽  
Fluctuation Model

In the IRT person-fluctuation model, the individual trait levels fluctuate within a single test administration whereas the items have fixed locations. This article studies the relations between the person and item parameters of this model and two central properties of item and test scores: temporal stability and external validity. For temporal stability, formulas are derived for predicting and interpreting item response changes in a test-retest situation on the basis of the individual fluctuations. As for validity, formulas are derived for obtaining disattenuated estimates and for predicting changes in validity in groups with different levels of fluctuation. These latter formulas are related to previous research in the person-fit domain. The results obtained and the relations discussed are illustrated with an empirical example.

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