Affiliation:
1. Faculty of Physical Chemistry, Belgrade
2. Faculty of Physics, Belgrade
Abstract
During plasma electrolytic oxidation of a magnesium alloy (96% Mg, 3% Al, 1%
Zn) we obtained a luminescence spectrum in the wave number range between 19
950 and 20 400 cm-1. The broad peak with clearly pronounced structure was
assigned to the v?-v? = 0 sequence of the B 1?+ ? X 1?+ electronic transition
of MgO. Quantum-mechanical perturbative approach was applied to extract the
form of the potential energy curves for the electronic states involved in the
observed spectrum, from the positions of spectral bands. These potential
curves, combined with the results of quantum-chemical calculations of the
electric transition moment, were employed in subsequent variational
calculations to obtain the Franck-Condon factors and transition moments for
the vibrational transitions observed. Comparing the results of these
calculations with the measured intensity distribution within the spectrum we
derived relative population of the upper electronic state vibration levels.
This enabled us to estimate the plasma temperature. Additionally, the
temperature was determined by analysis of the recorded A 2?+ (v? = 0) - X 2?
(v? = 0) emission spectrum of OH. The composition of plasma containing
magnesium, oxygen, and hydrogen under assumption of local thermal equilibrium
was calculated in the temperature range up to 12 000 K and for pressures of
105, 106, 107, and 108 Pa, in order to explain the appearance of the observed
spectral features and to contribute to elucidation of processes taking place
during the electrolytic oxidation of Mg.
Funder
Ministry of Education, Science and Technological Development of the Republic of Serbia
Publisher
National Library of Serbia
Cited by
4 articles.
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