We report extensive measurements, with sufficiently large statistics, of the Barkhausen noise ͑BN͒ in the case of the commercial VITROVAC 6025 X metal glass sample. Applying a very scrutinized numerical procedure, we have extracted over one million of the BN elementary signals from the raw experimental data, whereby we made a rather precise estimation of the relevant power law exponents. In conjunction with the experimental part of the work, we have recognized a generic shape of a single BN elementary signal ͑BNES͒, and we have put forward, without invoking any existing model of BN, a simple mathematical expression for BNES. Using the proposed expression for BNES in a statistical analysis, we have been able to predict scaling relations and an elaborate formula for the power spectrum. We have also obtained these predictions within the generalized homogeneous function approach to the BNES's probability distribution function, which we have substantiated by the corresponding data collapsing analysis. Finally, we compare all our findings with results obtained within the current experimental and theoretical research of BN. ͓S1063-651X͑96͒13409-7͔

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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.

The Stark widths of 13 Ar III spectral lines have been measured at an electron density of 3.5 × 10 23 m −3 and electron temperature of 38 000 K in a linear pulsed arc plasma discharge containing an argon-helium mixture. The measured values were compared to the existing calculated values based on semiclassical and semiempirical approximations.