TY - JOUR AU - Vinić, Milica AU - Kuzmanović, Miroslav AU - Savović, Jelena AU - Ivković, Milivoje PY - 2022/07/22 Y2 - 2024/03/29 TI - Diagnostics of laser-induced plasma from a thin film of oil on a silica wafer: Scientific paper JF - Journal of the Serbian Chemical Society JA - J. Serb. Chem. Soc. VL - 88 IS - 2 SE - Analytical Chemistry DO - 10.2298/JSC211228028V UR - https://www.shd-pub.org.rs/index.php/JSCS/article/view/11527 SP - 153-167 AB - <p>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 1.1×10<sup>17 </sup>cm<sup>-3</sup> (1.5 μs) to 1.5×10<sup>16</sup> cm<sup>-3</sup> (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.</p> ER -