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Radicals formation in supersonic plasma jet
Mašát, Milan ; Tichý, Milan (advisor) ; Glosík, Juraj (referee)
Title: Creation of radicals in electric discharge supersonic plasma jet Author: Milan MaSat Department: Department of Surface and Plasma Science Supervisor: Prof. RNDr. Milan Tichy, DrSc. Supervisor's e-mail address: Milan.Tichy@mff.cuni.cz Abstract: Free radicals are the key intermediates and propagators of chemical reactions in Earth's atmosphere. Study of their structure and chemical properties is vital for understanding the processes in atmosphere. But their high reactivity brings the need for specific research methods. In-situ preparation and non-invasive detection and characterization techniques are needed. Most commonly used laboratory techniques such as photodissociation or electric discharge generate radicals at temperatures that are significantly higher then those under atmospheric conditions, which we intendto model. In this work, I was developing a source of cold radicals and experimental techniques for measuring their properties. 1 combined plasma source, which creates sufficient concentrations of radicals with supersonic expansion in which the translational and internal degrees of freedom are cooled deeply below the room temperature. For their characterization I used high-resolution spectroscopy utilizing near infrared laser diodes. I also developed and built electronic circuits and software...
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Creation and characterization of cold molecules and molecular radicals in supersonic plasmatic nozzle
Mašát, Milan ; Votava, Ondřej (advisor) ; Glosík, Juraj (referee) ; Španěl, Patrik (referee) ; Kania, Patrik (referee)
Title: Creation and characterization of cold molecules and molecular radicals in supersonic plasmatic nozzle Author: Milan Mašát Department: J. Heyrovsky Institute of Physical Chemistry of the ASCR, v. v. i. (32-UFCHAV) Supervisor: Mgr. Ondřej Votava, Ph. D., J. Heyrovsky Institute of Physical Chemistry of the ASCR, v. v. i. (32-UFCHAV) Abstract: The aim of this work is the development and characterization of experimental apparatus designed for study of expansion-cooled stable and unstable molecule species in near infrared region, as well as associated methodology. This device consists of discharge source of cold molecular radicals and a system for their spectroscopic analysis. The source and the spectroscopic part changes and upgrades are described in detail. Characterization of radical source and its methodology was done on the OH radical model. Changes in radical properties under different experimental conditions, such as stagnation pressure, used voltage and different geometries of both the nozzle and electrodes are measured. Methodology of spectroscopic analysis was carried out on methane molecule in unassigned part of spectra, so called icosad region. Keywords: supersonic expansion, molecular radical source, high resolution spectroscopy
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Radicals formation in supersonic plasma jet
Mašát, Milan ; Tichý, Milan (advisor) ; Glosík, Juraj (referee)
Title: Creation of radicals in electric discharge supersonic plasma jet Author: Milan MaSat Department: Department of Surface and Plasma Science Supervisor: Prof. RNDr. Milan Tichy, DrSc. Supervisor's e-mail address: Milan.Tichy@mff.cuni.cz Abstract: Free radicals are the key intermediates and propagators of chemical reactions in Earth's atmosphere. Study of their structure and chemical properties is vital for understanding the processes in atmosphere. But their high reactivity brings the need for specific research methods. In-situ preparation and non-invasive detection and characterization techniques are needed. Most commonly used laboratory techniques such as photodissociation or electric discharge generate radicals at temperatures that are significantly higher then those under atmospheric conditions, which we intendto model. In this work, I was developing a source of cold radicals and experimental techniques for measuring their properties. 1 combined plasma source, which creates sufficient concentrations of radicals with supersonic expansion in which the translational and internal degrees of freedom are cooled deeply below the room temperature. For their characterization I used high-resolution spectroscopy utilizing near infrared laser diodes. I also developed and built electronic circuits and software...
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