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Diagnostics of molecular emission in laser induced plasmas and comparison to simulations

  • Spatial- and time-resolved experimental studies on atomic and ionic species in laser induced plasmas (LIP) were conducted extensively in the past. Such studies gave important insights to the complex mechanisms of the plasma formation and helped to establish models to simulate radiation of the plasma in due course of its evolution. On the other hand, the formation of molecular species in LIP is far less understood. This study aims at tomographic measurements of 3D distributions of molecular species in laser induced plasmas followed by the comparison of the results with a chemical model of LIP. Silicon, graphite and silicon-carbide were ablated into a mixture of nitrogen and argon of varying proportion. Emissions of molecular species including C2, CN, Si2 and SiN were recorded and their number densities as a function of the radial position in the plasma were calculated via Abel inversion. Most intense molecular emissions were observed to be from the plasma center and not from the colderSpatial- and time-resolved experimental studies on atomic and ionic species in laser induced plasmas (LIP) were conducted extensively in the past. Such studies gave important insights to the complex mechanisms of the plasma formation and helped to establish models to simulate radiation of the plasma in due course of its evolution. On the other hand, the formation of molecular species in LIP is far less understood. This study aims at tomographic measurements of 3D distributions of molecular species in laser induced plasmas followed by the comparison of the results with a chemical model of LIP. Silicon, graphite and silicon-carbide were ablated into a mixture of nitrogen and argon of varying proportion. Emissions of molecular species including C2, CN, Si2 and SiN were recorded and their number densities as a function of the radial position in the plasma were calculated via Abel inversion. Most intense molecular emissions were observed to be from the plasma center and not from the colder plasma rim. This finding does not agree with simulation results obtained for spherically symmetric plasmas, suggesting the assumption of spherical symmetry may cause the disagreement. In fact, further experimental studies reveal a pronounced formation of vortices under certain experimental conditions. Mechanisms for the vortex formation are further investigated under various laser ablation conditions. Methods to incorporate the vortex formation into the simulations are proposed.zeige mehrzeige weniger

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Metadaten
Autor*innen:Reto Glaus
Koautor*innen:Sergej V. Shabanov, Igor B. Gornushkin
Dokumenttyp:Posterpräsentation
Veröffentlichungsform:Präsentation
Sprache:Deutsch
Titel des übergeordneten Werkes (Deutsch):8th euro-mediterranean symposium on laser-induced breakdown spectroscopy 2015
Jahr der Erstveröffentlichung:2015
Veranstaltung:8th euro-mediterranean symposium on laser-induced breakdown spectroscopy 2015
Veranstaltungsort:Linz, Austria
Beginndatum der Veranstaltung:2015-09-14
Enddatum der Veranstaltung:2015-09-18
Verfügbarkeit des Dokuments:Weder Datei noch physisches Exemplar vorhanden ("No Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Nein
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