Abstract
The effect of atomic and molecular microfield 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 are compared with Chen and Takeo’s theory (CT), which is in good agreement with experimental data. It is demonstrated that, for moderate values of temperature and density, the FFM successfully describes the effect of the microfield dynamics on a spectral line shape.
Highlights
The problem of the microfield dynamics effect on a spectral line shape was recognized many years ago [1,2,3]
In the present paper we considered the case of n = 6, which corresponds to a wide class of van der Waals interactions
The numerical calculations showed that, for ν ∼ 1, the Frequency Fluctuation Model (FFM) was in good agreement with Chen and Takeo’s theory (CT)
Summary
The problem of the microfield dynamics effect on a spectral line shape was recognized many years ago [1,2,3]. Simulations provides the Frequency Fluctuation Model (FFM) [7] It is based on dividing a spectral line contour in a static field into separate regions, between which there is an exchange of intensities due to thermal motion. This model is widely used for spectral line shape calculations in plasmas (see, e.g., [8,9,10,11,12,13]). It was shown that the FFM is equivalent to the method of the quantum kinetic Equation [14] This approach makes it possible to reformulate the FFM in terms of analytical expressions. This circumstance allows one to use simple analytical expressions and perform fast calculations of a spectral line shape for arbitrary values of temperatures and densities
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