Spectroscopic Methods for Concentration Measurements and Calibration of Reactive Gases

Abstract

The topic of my dissertation is focused on utilization of spectroscopic methods for detection and measurement of various molecular systems that are interesting from the point of view of their reactivity and role that they play in atmospheric chemistry, astrochemistry, human body, or in simulated plasma processes. Description of the work is divided into four thematic parts describing four independently performed experiments. The very first analyses of the asymmetrical vibration ν4 band and the symmetrical ν2 band of the FCO2· radical, that belong among significant intermediate products of degradation processes of halogen hydrocarbons, were performed within this work. The detailed analysis led to determination of rotational constants, centrifugal distortion constants, and fine splitting constants of both bands. For the first time in history we performed the spectroscopically unambiguous identification of the molecular radical ion CS+ using the microwave spectroscopy with high spectral resolution in the frequency range of 414 to 622 GHz. The complex analysis allowed us to exactly determine the values of the rotational constant, fine splitting constant, and hyperfine splitting constant. It was also designed and performed experiments including measurements of spectra of cyan BrCN and CH3CN substances using the time resolved Fourier transform infrared spectroscopy. It was studied behavior of these molecules and their disintegration products in the low temperature plasma environment. Finally, I have studied the ecological impact of ammonia on the environment and influence of trees on the amount of ammonia in the air, and designed and assembled the optoacoustic cell for the experimental arrangement of the laser optoacoustic detection method for measuring trace amounts of ammonia and other gaseous substances.