Effects of radiator motion on plasma-broadened hydrogen lyman-β

Seidel, Joachim; Stamm, R.

doi:10.1016/0022-4073(82)90102-9

Cited by 50 publications

(32 citation statements)

References 20 publications

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“…To include the movement of the emitter we used the so called μ-ion model (Seidel & Stamm 1982), which considers that the velocities statistic of the relative movement between the emitter and the perturbers conform to a Maxwell-Boltzmann distribution with a perturber's mass equal to the reduced mass of the pair emitter-perturber. With this technique we can also Notes.…”

Section: Stark-broadening Model In Computer Simulationsmentioning

confidence: 99%

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Stark broadening of lines from transition between statesn = 3 ton = 2 in neutral helium

Djurović

Savić

et al. 2014

A&A

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Context. The Stark broadening of the spectral lines of the wavelengths 501. 6, 667.8, 728.1, 388.9, 587.6, and 706.5 nm from neutral helium in plasmas are studied theoretically and experimentally. Aims. The aim of this work is to provide information about the connection between the shape and width of spectral lines and the electron density and temperature to be used as a diagnostic tool. Methods. The theoretical calculations were carried out through molecular dynamics computer simulations with noninteracting particles. The experimental measurements were done in a plasma of pure helium generated in an electromagnetically driven T-tube. The plasma diagnostics used previous results about the Stark broadening of the He I 447.1 nm and He I 492.2 nm lines and the coherence between the shape of these spectra and those obtained here. The electron temperature was obtained through a Boltzmann-plot of eight lines of Si II. Results. Several tables of width and shift are provided in a wide range of electron density and temperature. Furthermore, we supply several fitting formulas, which allow calculating the plasma electron density from the measured values of the spectral line widths. The results obtained in the laboratory and in the simulations are compared with the data from the literature.

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Section: Stark-broadening Model In Computer Simulationsmentioning

confidence: 99%

“…The calculation procedure includes in a natural way the ion movement according to the μ-ion model (Seidel & Stamm 1982). The parameter μ regulates the influence of the ion movement.…”

Section: Ion Dynamic Effectsmentioning

confidence: 99%

Stark broadening of lines from transition between statesn = 3 ton = 2 in neutral helium

Djurović

Savić

et al. 2014

A&A

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“…We used a spherical volume that contains N ions and N electrons (N = 500 in this work) randomly placed and moving independently following straight-line trajectories with constant speed. The speeds of those particles obey the Maxwell distribution according to the equilibrium temperature of each of the species and a mass equal to the reduced mass of the emitterperturber pair (μ−ion model (Seidel & Stamm 1982)). When one of those particles reaches the border of the simulation sphere, it is replaced by another particle so that the density of particles in the sphere is kept constant.…”

Section: Physical Model For the Plasma In The Computer Simulationmentioning

confidence: 99%

Stark broadening tables for the helium I 447.1 line

Ma¹,

González²

2009

A&A

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Context. Stark broadening of the 447.1 line of neutral helium in a weakly coupled plasma has been studied. This spectral line has a very close forbidden component. This means it is very sensitive to the plasma electron density, which is similar to hydrogen lines, for which the Stark effect is linear. Aims. The aim of this work is to supply information to be used in the spectroscopic diagnostics of plasmas. Methods. We used computer simulations in the frame of a physical model for a plasma with weak coupling between charges. The calculation includes the so-called "ion dynamics effects" in a natural way. The electron density, the ionic and electronic temperatures, and the perturber mass were the parameters in the calculations. Results. Simulation results relate the line width, shift, shape, and especially the ratio of intensities between the allowed and forbidden components, with the plasma parameters. These results are supplied as tables of line shapes.

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“…On the other hand, when Doppler is comparable or more important than Stark the two effects are correlated and both mechanisms must be calculated simultaneously. In [49] However the main factor that limits the common Stark theories is the presence of a fine structure. The H β spectral line consists of a series of components or individual transitions spectrally positioned at small distances from each other.…”

Section: Doppler-stark Coupling and Fine Structurementioning

confidence: 99%

Hβ Stark broadening in cold plasmas with low electron densities calibrated with Thomson scattering

Palomares

Hübner

Carbone

et al. 2012

Spectrochimica Acta Part B: Atomic Spectroscopy

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In the present work Stark broadening measurements have been carried out on low electron density (n e b 5·10 19 m −3) and (relatively) low gas temperature (T g b 1100 K) argon-hydrogen plasma, under low-intermediate pressure conditions (3 mbar-40 mbar). A line fitting procedure is used to separate the effects of the different broadening mechanisms (e.g. Doppler and instrumental broadening) from the Stark broadening. A Stark broadening theory is extrapolated to lower electron density values, below its theoretical validity regime. Thomson scattering measurements are used to calibrate and validate the procedure. The results show an agreement within 20%, what validates the use of this Stark broadening method under such low density conditions. It is also found that Stark broadened profiles cannot be assumed to be purely Lorentzian. Such an assumption would lead to an underestimation of the electron density. This implies that independent information on the gas temperature is needed to find the correct values of n e .

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Effects of radiator motion on plasma-broadened hydrogen lyman-β

Cited by 50 publications

References 20 publications

Stark broadening of lines from transition between statesn = 3 ton = 2 in neutral helium

Stark broadening of lines from transition between statesn = 3 ton = 2 in neutral helium

Stark broadening tables for the helium I 447.1 line

Hβ Stark broadening in cold plasmas with low electron densities calibrated with Thomson scattering

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