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Journal of the Serbian Chemical Society 2023 Volume 88, Issue 2, Pages: 153-167
https://doi.org/10.2298/JSC211228028V
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Diagnostics of laser-induced plasma from a thin film of oil on a silica wafer

Vinić Milica ORCID iD icon (Institute of Physics, University of Belgrade, Belgrade, Serbia)
Kuzmanović Miroslav ORCID iD icon (Faculty of Physical Chemistry, University of Belgrade, Belgrade, Serbia)
Savović Jelena ORCID iD icon (VINČA Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia)
Ivković Milivoje ORCID iD icon (Institute of Physics, University of Belgrade, Belgrade, Serbia), ivke@ipb.ac.rs

In this study, plasma induced by a nanosecond Nd:YAG laser on thin oil films deposited on a silica wafer was characterized by evaluating the main plasma parameters. Spatially and temporally integrated spectral measurements were performed under experimental conditions optimized for elemental analysis of trace metals in oil. Time-resolved values of the spectral line intensities, electron number density, and plasma temperature were obtained from time-integrated measurements by subtracting averaged spectra recorded at different time delays. The electron number density was estimated using the Stark broadened profile of the hydrogen Balmer alpha line. Ionization temperatures were derived from Mg ionic to atomic line intensity ratios. The obtained apparent values of time-resolved plasma parameters were in the range of 1.1×1017 cm-3 (1.5 μs) to 1.5×1016 cm-3 (4 μs) and 9400 K (3 μs) to 7200 K (5 μs), depending on the delay time. Emission spectra of C2 and CN molecules were used to evaluate the rotational and vibrational temperature.

Keywords: electron number density, plasma temperature, time-integrated, time-resolved

Projects of the Serbian Ministry of Education, Science and Technological Development, Grant no. 451-03-9/2021-14/200024, Grant no. 451-03-9/2021-14/200146, and Grant no. 451-03-9/2021-14/200017

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