Stark broadening of Xe viii spectral lines
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Abstract:
Stark broadening parameters have been calculated for 60 spectral lines of Xe viii, for broadening by electron, proton, and He iii impacts. For calculations, the semiclassical perturbation approach in the impact approximation has been used. The widths and shifts are provided for temperatures from 20 000 K to 500 000 K and for an electron density of 1017 cm−3. Obtained results have been used to study the influence of Stark broadening on spectral lines in DO white dwarf atmospheres and it has been found that exist broad layers where this broadening mechanism is dominant in comparison with thermal Doppler broadening.Keywords:
Homogeneous broadening
Semiclassical physics
In thermal plasma spectroscopy, Stark broadening measurement of hydrogen spectral lines is considered to be a good and reliable measurement for electron density. Unlike intensity based measurements, Stark broadening measurements can pose a problem of interpretation when the light collected is the result of a spatial integration. Indeed, when assuming no self-absorption of the emission lines, intensities simply add up but broadenings do not. In order to better understand the results of Stark broadening measurements on our thermal plasma which has an unneglectable thickness, a Python code has been developed based on local thermodynamic equilibrium (LTE) assumption and calculated plasma composition and properties. This code generates a simulated pseudo experimental (PE) H α spectral line resulting from an integration over the plasma thickness in a selected direction for a given temperature profile. The electron density was obtained using the Stark broadening of the PE spectral line for different temperature profiles. It resulted that this measurement is governed by the maximum electron density profile up until the temperature maximum exceeds that of the maximum electron density. The electron density obtained by broadening measurement is 60–75% of the maximum electron density.
Electron temperature
Homogeneous broadening
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Stark broadening parameters have been calculated for 60 spectral lines of Xe viii, for broadening by electron, proton, and He iii impacts. For calculations, the semiclassical perturbation approach in the impact approximation has been used. The widths and shifts are provided for temperatures from 20 000 K to 500 000 K and for an electron density of 1017 cm−3. Obtained results have been used to study the influence of Stark broadening on spectral lines in DO white dwarf atmospheres and it has been found that exist broad layers where this broadening mechanism is dominant in comparison with thermal Doppler broadening.
Homogeneous broadening
Semiclassical physics
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Laser-induced fluorescence of the Hα transition of atomic hydrogen has previously been performed in the plume of a hydrogen arcjet thruster. Measurements of plasma velocity and temperature, based on the Doppler shift and broadening of the Hα line shape, were previously published [Appl. Opt. 32, 6117 (1993)]. In that paper the Stark broadening of the Hα transition was estimated from static-ion calculations performed in the early 1970’s and found to be negligible in comparison with the Doppler broadening. However, more recent dynamic-ion calculations have shown the Stark broadening to be considerably larger than was previously assumed, resulting in inaccurate temperature measurements. We present a reanalysis of the fluorescence data, taking into account the improved Stark broadening calculations. The correct atomic hydrogen translation temperature and electron number density are obtained from the Doppler and Stark broadening components of the measured line shape. The results indicate a substantial drop in temperature from those previously reported.
Arcjet rocket
Homogeneous broadening
Electron temperature
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The Stark broadening parameters of Ne I 837.8 nm spectral line corresponding to the transition 2p53d 2[7/2]°4 − 2p53p 2[5/2]3 have been calculated using Sahal-Bréchot theory. The temperature dependence of the width and shift has been obtained.
Homogeneous broadening
Line (geometry)
Spectral line shape
Line width
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Stark line broadening of the n=4 to 3 transitions of He‐like Ne, Mg, and Al in multicharged ion plasmas is considered. Line profiles calculations involved quasi‐static ion broadening, impact electron broadening, natural, and Doppler broadening. Considerable effect of Stark line broadening due to plasma ions for the 4F–3D transitions of He‐like Ne is demonstrated at the Ne‐plasma parameters yielding a maximum gain in the theoretical modeling of the resonantly photopumped Na‐Ne x‐ray laser scheme under the conditions of the Saturn experiments. The sensitivity of the calculated line profiles to the intermediate coupling effects and different energy level data is also investigated. Calculated line profiles of the 4F–3D transitions in He‐like Mg and Al are compared to the experimental and other theoretical data.
Homogeneous broadening
Line (geometry)
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Homogeneous broadening
Thomson scattering
Electron temperature
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A computer simulation technique is applied to the modelling of Balmer line shapes in dense divertor conditions. The spectral profile of lines with a high principal quantum number n is sensitive to Stark broadening and can be used as a density diagnostic. In contrast, an analysis of the shape of low or moderate n lines such as D α ( n = 3), D β ( n = 4), and D γ ( n = 5) is more intricate because the Stark effect is weaker and can compete with thermal Doppler broadening. We examine this issue and address the relative contribution of the Stark and Doppler effects on the first Balmer lines. Analyses of experimental spectra are performed.
Balmer series
Line (geometry)
Homogeneous broadening
Quantum number
Principal quantum number
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Electron density is one of the key parameters in the physics of a gas discharge. In this contribution the application of the Stark broadening method to determine the electron density in low temperature atmospheric pressure plasma jets is discussed. An overview of the available theoretical Stark broadening calculations of hydrogenated and non-hydrogenated atomic lines is presented. The difficulty in the evaluation of the fine structure splitting of lines, which is important at low electron density, is analysed and recommendations on the applicability of the method for low ionization degree plasmas are given. Different emission line broadening mechanisms under atmospheric pressure conditions are discussed and an experimental line profile fitting procedure for the determination of the Stark broadening contribution is suggested. Available experimental data is carefully analysed for the Stark broadening of lines in plasma jets excited over a wide range of frequencies from dc to MW and pulsed mode. Finally, recommendations are given concerning the application of the Stark broadening technique for the estimation of the electron density under typical conditions of plasma jets.
Homogeneous broadening
Line (geometry)
Electron temperature
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Homogeneous broadening
Voigt profile
Line (geometry)
Spectral line shape
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The Doppler broadening, the natural broadening, and the quasi-static broadening are introduced. The last broadening is due to the Stark effect in the Holtsmark micro-field with the Debye shielding. Plasma electrons give rise to the impact broadening, which is discussed in detail. For neutral hydrogen and hydrogen-like ions for which the linear Stark effect is dominant, the quasi-static broadening tends to be important. For other atom (ion) species, which are subjected to the quadratic Stark effect, the impact broadening tends to be dominant. The Inglis-Teller limit, which results from the line broadening becoming comparable with the line separation, is useful for a rough estimate of plasma density. Convolution of a Lorentzian profile and a Gaussian profile yields a Voigt profile.
Homogeneous broadening
Line (geometry)
Debye
Voigt profile
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