Undergraduate Thesis Or Project
 

Measuring Low Intensity Light Reflections of High Temperature CO₂ Adsorbed on SiO₂ Near Brewster's Angle

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  • This investigation expands on earlier methods of using surface polarization reflection (SPR) to characterize the first few monolayers of a surface. Past research measured intensities of light reflecting off an SiO₂ optical flat inside a vacuum. Pressure of applied gas was changed to view a change in reflection. In an attempt to remove the need of a vacuum chamber, this experiment was run in the open air. P-polarized light is reflected at Brewster's angle to measure low intensity reflections. Using an SBIG 8300 CCD camera intensities are measured in an open air environment and compared to that of applied CO₂ by the use of a gas jet. SPR theory predicts that higher polarizabilities will cause a larger reflection. Temperature of the applied gas was increased in order to quantify a difference in reflections based on this change in temperature. Removing ambient particles from the open air by use of a heated gas stream was thought to change the signal to a more consistent level of measurement. The intensity was found to change at higher temperatures but no trend was quantified. Increasing the temperature beyond 323K caused signal fluctuation and was found not to be beneficial in SPR analysis. SPR was found to not have been improved by heating the applied gas.
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  • A big thanks to the Oregon State University Physics department for funding this research.
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