High sensitivity optical spectroscopy of plasma and gases

Abstract : The project of this thesis was developed as a joint supervision project between the Department of Experimental Physics at Comenius University in Bratislava and Laboratoire de Spectrometrie Physique at Joseph Fourier University in Grenoble. The aim of the project is the development and application of some of these new spectroscopic methods for the study and diagnostics of gases and plasma. In Bratislava the work under the supervision of prof. Pavel Veis and Doc. Peter Macko was oriented towards the optical diagnostics of plasma environments. Beside the principal experiments concerning the dielectric barrier discharge (DBD) and production of the singlet oxygen state, the goal was to develop spectroscopic methods capable of providing physical measurements related to this applications. In the DBD the interest was focused on the description of the excited electronic states population variations during the period of discharge. We used fast broad--band emission spectroscopy (FEBS) comprising the instrument and data treatment process to achieve this goal. In case of singlet oxygen production we developed a Cavity ring--down spectrometer (CRDS) to detect the singlet oxygen by its infrared absorption in the microwave plasma afterglow. In Grenoble under the supervision of Dr. Daniele Romanini the principal line of work consisted in the development of a new laser source - Vertical external cavity surface emitting laser (VECSEL) and its application to absorption spectroscopy. The work was held in collaboration with the Institude d'electronique du Sud in the frame of the joint ANR MIREV project. A period was also dedicated to the developing of a small, fast, robust and low-cost NO$_2$ and NO$_3$ detector based on the Incoherent broad--band cavity enhanced absorption spectroscopy (IBB--CEAS).
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Peter Cermak. High sensitivity optical spectroscopy of plasma and gases. Atomic Physics [physics.atom-ph]. Université de Grenoble, 2010. English. ⟨tel-00564511⟩



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