Plasma broadening and shifting of non-hydrogenic spectral lines: present status and applications

In this paper, we report modifications of well known semiempirical and semiclassical approximation furmulas for Stark line-width calculations. Comparisons with experiments for doubly ionized atoms yield, as an average ratio of measured to calculated widths 1.06 ± 0.31 for a modified semiempirical formula and 0.96±0.24 for a modified semiclassical formula. For triply ionized atoms these ratios are 0.91±0.42 and 1.08±0.41, respectively. Comparison with other theoretical calculations have also been made.

Stark widths of doubly- and triply-ionized atom lines☆

Experimental Stark widths and shifts for spectral lines of neutral and ionized atoms A critical review of selected data for the period 2001–2007 ☆

Regularities and similarities in plasma broadened line widths have been studied by a comprehensive analysis of existing experimental data. Regularities are expected on the basis of general atomic structure considerations, and should be evident for spectral series, for corresponding transitions in homologous atoms and in isoelectronic sequences. Furthermore, similarities of line widths are expected for multiplets, supermultiplets and, to a lesser degree, for transition arrays. A comprehensive examination of literature data has been undertaken, which shows generally a close adherence of the measured data to the expected regularities. A few notable exceptions are also given.

Regularities and similarities in plasma broadened spectral line widths (Stark widths)

This paper deals with recent advances in search for possible types of regularities and systematic trends in the Stark broadening and shift parameters. The emphasis is (i) on the Stark parameters' dependence on the ionization potential from the upper level of a corresponding transition (which, after being established, is used for the theoretical prediction of these parameters for the spectral lines where not available) and (ii) on the experimental determination of the Stark line broadening and shift parameters of group-IV and -V homologous singly charged ions. The data set obtained in such a way, together with existing experimental and theoretical data, are used to demonstrate the existence of several other types of common regularities in the Stark widths and shifts of the lines originating from the same type of transition of neutral atoms and singly charged ions of the elements along the periodic system.

Regularities and systematic trends in the Stark broadening and shift parameters of spectral lines in plasma

Stark widths and shifts of Ne II spectral lines.

Stark-broadening regularities of prominent multiply-ionized-oxygen spectral lines in plasma.

The Stark width and shift of six Zn ii and six Cd ii spectral lines have been measured for the electron-density range of 1.0\ifmmode\times\else\texttimes\fi{}${10}^{23--}$1.23\ifmmode\times\else\texttimes\fi{}${10}^{23}$ ${\mathrm{m}}^{\mathrm{\ensuremath{-}}3}$ and for an electron-temperature range of 23 000--33 000 K in a pulsed linear arc plasma discharge in ${\mathrm{SF}}_{6}$ and argon-helium mixture. Obtained Stark-width data were compared with the values calculated on the basis of various theoretical approaches.

Stark broadening and shift of singly ionized zinc and cadmium spectral lines.

Spectral lines emited by first three ionisation species of silicon were studyed in a wide range of plasma parameters. The silicon was present as an impurity in the argon plasma created in an electromagneticT tube. Four various condenser bank energies give the plasma in a range of temperatures 8700 to 16400°K and electron concentrations 2.95·1017 cm−3to 5.6·1017 cm−3.

Stark broadening parameters of Si I, Si II and Si III lines

Half-widths of fifteen Stark broadened argon II lines have been measured in argon plasma behind the reflected shock wave produced in an electromagnetically driven “T” tube. The plasma electron density was determined by the laser interferometry at three different wavelengths, while the plasma temperature was measured from relative intensities of A II lines. Temperatures were in the range 8,500–16,500 °K; electron densities varied from 1.82 to 3.94 · 1017 cm−3. The measured A II linewidths are compared with theoretical and other experimental results. It is shown that a) the broadening of A II lines is in good agreement with the theory, b) line broadening increases linearly with electron density, and c) the Stark broadened lines follow the dispersion profile to the distance of at least three halfwidths from the line center.

Measurement of the Stark broadening parameters of some singly ionized argon lines

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