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1

Analysis of Line Strength Data for the Spectra οf C(I), N(II), N(I) and O(II)

100%

Bacławski A., Musielok J.

Acta Physica Polonica A

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2009

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vol. 116

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issue 2

176-184

EN

Recently determined experimental and theoretical data on line strengths within 3s-3p and 3p-3d multiplets for C(I), N(II), N(I) and O(II) are analyzed. An overall satisfactory agreement between experimental data and results of recent sophisticated calculations is found with exception of only some weaker transitions. However, the measured and calculated relative line strengths disagree significantly with data resulting from the LS coupling scheme, particularly for 3p-3d transitions. In numerous cases these differences are - to a considerable degree - "regular" along the isoelectronic sequences C(I)-N(II) and N(I)-O(II). For some multiplets these discrepancies also correlate with departures from the Landé interval rule for terms involved in the corresponding transitions.

2

Calculation of Population Densities of Excited CI and CII Levels in Helium and Argon Plasmas Containing Small Admixtures of CO_{2} - Importance to Analysis of Radiation Emitted from Plasmas of Axial Symmetry

100%

Bacławski A., Musielok J.

Acta Physica Polonica A

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1997

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vol. 91

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issue 3

519-529

EN

Population densities of excited CI and CII levels are calculated in helium and argon plasmas containing small admixtures of CO_{2}. Calculations are performed for a total pressure of 1 atmosphere, in a temperature interval from 8000 K to 40000 K, assuming local thermal equilibrium (LTE) and partial local thermal equilibrium (pLTE) conditions. Normal temperatures are obtained for selected excited CI and CII levels. The results are applied to a helium plasma with traces of CO_{2}, of cylindrical symmetry with presumed radial temperature distribution. Effective intensities of CI and CII spectral lines, corresponding to side-on radiance measurements along the cylinder diameter are evaluated. On hand of these effective line intensities and applying the Boltzmann plot method effective temperatures are evaluated and compared with the presumed temperature distribution.

3

Studies of the Bromine Spectrum and Determination of Transition Probabilities for Br I and Br II Lines

81%

Wujec T., Bacławski A., Golly A., Książek I.

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vol. 96

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issue 3-4

333-340

EN

In a wall-stabilized cascade arc at atmospheric pressure in mixtures of argon and bromine vapors thermal plasmas were generated. Arc currents between 25 and 60 A were used. Applying a spectrometer of medium dispersion, equipped with an optical multichannel analyzer (CCD detector), the spectra of neutral and singly ionized bromine in the range between 3300 and 10400 Å were recorded. Line intensity measurements, corrected for self-absorption, at different operating conditions of the arc, were performed. A complete set of Br I transitions (5 lines) originating from a common upper level (branching fractions) was measured. In the case of the Br II spectrum intensities of 14 lines were determined. Both sets of lines (Br I and Br II) were normalized to an absolute scale using appropriate lifetime values. The uncertainties of the new determined transition probabilities depend mainly on the uncertainties of the lifetime data taken from the literature. The results are compared to other experimental data. Discrepancies are found to be outside of uncertainties of the measurements.

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3 Acta Physica Polonica A

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3 Bacławski A.

2 Musielok J.

1 Golly A.

1 Książek I.

1 Wujec T.

Analysis of Line Strength Data for the Spectra οf C(I), N(II), N(I) and O(II)

Calculation of Population Densities of Excited CI and CII Levels in Helium and Argon Plasmas Containing Small Admixtures of CO_{2} - Importance to Analysis of Radiation Emitted from Plasmas of Axial Symmetry

Studies of the Bromine Spectrum and Determination of Transition Probabilities for Br I and Br II Lines