Laboratory spectroscopic study of acetylene and carbon dioxide for atmospheric remote sensing purposes

Thumbnail Image
Mashwood, Abdullah Al
University of Lethbridge. Faculty of Arts and Science
Journal Title
Journal ISSN
Volume Title
Lethbridge, Alta : University of Lethbridge, Dept. of Physics and Astronomy
This thesis presents line-shape studies of carbon dioxide and acetylene, found as trace constituents in planetary atmospheres. The v1+v3 band of acetylene broadened by CO2 was recorded using a tunable diode laser spectrometer at different pressures (50-750 Torr) and temperatures (216-333 K) to retrieve pressure induced line-shape parameters as well as their temperature dependences. A second study was carried out to analyze line shapes of the Q-branch transitions of three weak bands (12201-03301, 11101-10002 and 12201-11102) of pure CO2 recorded at room temperature and different pressures (0.2-140 Torr) using a Fourier transform spectrometer. For both of these studies a non-linear least squares fitting software was used. A constraint analysis was performed in the CO2 study in order to reduce correlations between the retrieved line-shape parameters. Furthermore, theoretical calculation of line mixing parameters corresponding to the three bands of CO2 was performed using Exponential Power Gap (EPG) law.
infrared spectroscopy , line shape study of acetylene , line shape study of carbon dioxide , molecular spectroscopy