Tvorba radikálů v plazmatu výboje v supersonické trysce

Abstract

Nazev prace: Tvorba radikalu v plazmatu vyboje v supersonicke trysce Autor: Milan Masat Katedra (ustav): Katedra fyziky povrchu a plazmatu Vedouci diplomove prace: Prof. RNDr. Milan Tichy, DrSc. e-mail vedouciho: Milan.Tichy@mif.cuni.cz Abstrakl: Volne radikaly hraji klfcovou ulohu v chemickych reakcich v atmosfefe zeme. Studium jejich struktury a chemickych vlastnosti je tedy dulezite pro pochopeni deju v atmosfefe. Jejich vysoka reaktivita ale pfinaSi potfebu speciflckych metod zkoumani, mezi hiavni omezeni patfi kratka doba zivota a tedy nutnost jejich zkoumani ihned po jejich tvorbe. Pfi pouziti bfiznych laboratornich metod tvorby radikalu tyto vznikaji s teplotami vyrazne vySSimi nez v podmtnkach atmosfery, kterym se chceme v laboratofi pfiblizit. V ramci teto diplomove" prace jsem pracoval na vyvoji zdroje chladnych radikdlu a zafizeni pro zkoumani jejich charakteristik. Kombinuji zde plazmaticky zdroj, ktery poskytuje dostateCne koncentrace volnych radikalu se supersonickou expanzi, ve ktere jsou translaCni i vnitfni stavy radikalu ochlazeny na tcploty hluboce pod pokojovou teplotou. K jejich charakterizacijsem vyuzil metody spektroskopie s vysokym rozlisenim za pouziti diodovych laseru pracujicich v blizke infracervene oblasti. V ramci teto prace probdhl i vyvoj a vyroba elektronickych zafizeni a...

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...