Principal component analysis of the main factors of line intensity enhancements observed in oscillating direct current plasma |
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Authors: | Milovan M. Stoiljković,Igor A. Pa&scaron ti,Milo&scaron D. Momčilović,Jelena J. Savović,Mirjana S. Pavlović |
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Affiliation: | 1. VIN?A Institute of Nuclear Sciences, Department of Physical Chemistry, University of Belgrade, P. O. Box 522, 11001 Belgrade, Serbia;2. Faculty of Physical Chemistry, University of Belgrade, P. O. Box 137, 11001 Belgrade, Serbia |
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Abstract: | Enhancement of emission line intensities by induced oscillations of direct current (DC) arc plasma with continuous aerosol sample supply was investigated using multivariate statistics. Principal component analysis (PCA) was employed to evaluate enhancements of 34 atomic spectral lines belonging to 33 elements and 35 ionic spectral lines belonging to 23 elements. Correlation and classification of the elements were done not only by a single property such as the first ionization energy, but also by considering other relevant parameters. Special attention was paid to the influence of the oxide bond strength in an attempt to clarify/predict the enhancement effect. Energies of vaporization, atomization, and excitation were also considered in the analysis. In the case of atomic lines, the best correlation between the enhancements and first ionization energies was obtained as a negative correlation, with weak consistency in grouping of elements in score plots. Conversely, in the case of ionic lines, the best correlation of the enhancements with the sum of the first ionization energies and oxide bond energies was obtained as a positive correlation, with four distinctive groups of elements. The role of the gas-phase atom-oxide bond energy in the entire enhancement effect is underlined. |
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Keywords: | DC arc plasma Line intensity enhancement Magnetic field effect First ionization energy Oxide bond energy Principal component analysis |
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