Date of Award
Master of Science
Department of Engineering Physics
Glen P. Perram, PhD.
The purpose of this research was to observe the core and far wing absorption spectra of the D1 and D2 lines of cesium (Cs) perturbed by argon (Ar). A 1.33 m scanning monochromator with a PMT detector was used to measure the spectra from 8300 Ang. to 9100 Ang.. A heat pipe was used to control the Cs concentration and Ar pressure allowing for a broad range of spectra to be collected. Spectra were collected for heat pipe temperatures of 50, 75, 100, 125, 150 and 175 °C, corresponding to Cs concentrations of approximately 6×10^11, 4×10^12, 2×10^13, 5×10^13, 2×10^14, and 9×10^14 cm^-3. This was done for each Ar buffer gas pressure of 100, 200, 300, 400, 484, 746, 1124, 1504, 1884, and 2280 Torr. The D2 blue satellite absorption line was measured at a wavelength of 8367±0.8 Ang. for Ar pressures from 500 to 2280 Torr. A linear relationship between the D2 wing cross section and increasing Ar pressure was observed for pressures from 100 to 1504 Torr. Measured spectra were compared to spectra produced by two theoretical models the quantum quasi static approach and the static limit of Anderson-Talman theory.
Lott, Gordon E., "Cesium Absorption Spectrum Perturbed by Argon: Observation of Non-Lorentzian Far Wings" (2012). Theses and Dissertations. 1181.