On the basis of the precisely recorded 20 neutral krypton ͑Kr I͒ line shapes ͑in the 5s-5p and 5s-6p transitions͒, we have obtained the basic plasma parameters, i.e., electron temperature ͑T͒ and electron density ͑N͒ using our line deconvolution procedure in a plasma created in a linear, low-pressure, pulsed arc discharge operated in krypton. The mentioned plasma parameters have also been measured using independent experimental diagnostics techniques. Agreement has been found among the two sets of the obtained parameters. This recommends our deconvolution procedure for plasma diagnostical purposes, especially in astrophysics where direct measurements of the main plasma parameters (T and N) are not possible. On the basis of the observed asymmetry of the Stark broadened line profile, we have obtained not only its ion broadening parameter ͑A͒ which is caused by influence of the ion-microfield over the line broadening mechanism but also the influence of the ion-dynamic effect ͑D͒ over the line shape. The separate electron (W e) and ion (W i) contributions to the total Stark width, which have not been measured so far, have also been obtained. Stark widths are calculated using the semiclassical perturbation formalism for electrons, protons, and helium ions as perturbers.

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Abstract. Using the relative line intensity ratios method between transitions that belong to the same multiplet in the Ar III (4s − 4p, 4s − 4p and 4p − 4d transitions) and Ar IV (4s − 4p and 4s − 4p transitions) spectra, some of the existing transition probability values (A) have been controlled. On the basis of the confirmed A values in Ar III (328.585 nm, 330.188 nm, 331.125 nm, 333.613 nm and 334.472 nm) and in Ar IV (280.944 nm and 278.896 nm) spectra two A values in Ar III and seven A values in Ar IV spectra have been determined, for the first time, relatively to the confirmed A values. Beside, some of the existing theoretical A data have been corrected, according to our experimentally observed relative line intensity ratio values. Measurements have been performed by using the linear low pressure pulsed arc, as an optically thin plasma source, operated in argon-helium mixture.

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Abstract. On the basis of the observed asymmetry of the measured spectral line profiles we have obtained the ion contribution to the Ne  (26 lines), Ar  (19 lines) and Kr  (20 lines) spectral line broadening due to the quasi-static ion approximation and ion-dynamical effects. The ion broadening parameters (A) and the ion dynamic coefficients (D) have been obtained directly by the use of our line deconvolution procedure which allows the determination of the basic physical properties that characterize the line profile and also the relevant plasma parameters. We are the first to publish experimental data, viz. D and A values for the Ne , Ar  and Kr  lines. The 26 Ne , 6 Ar  and 9 Kr  A values are the first measured data and many of them are the first published data in this field. We have found clear evidence of the quasi-static ion and ion-dynamical effects on the investigated line shapes; they play a much more important role than the approaches based on semiclassical theory provide, especially in the case of the Ne  spectral lines. This is of importance for astrophysical plasma modeling and diagnostics.