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Full-Text Articles in Physical Sciences and Mathematics
Resolution Of Overlapping Spectra By Wavelength Modulation Spectroscopy, Audra Michiele Bullock
Resolution Of Overlapping Spectra By Wavelength Modulation Spectroscopy, Audra Michiele Bullock
Electrical & Computer Engineering Theses & Dissertations
Wavelength modulation absorption spectroscopy is a highly sensitive, non-intrusive technique for probing gaseous species, which employs the well-known principles of modulation spectroscopy in a novel way. With this technique, parameters such as velocity, density, and temperature can be measured with a high degree of precision. The research presented here shows that wavelength modulation is a convenient means of increasing the sensitivity of an absorption spectroscopy measurement because it allows for harmonic detection. The focus of the dissertation is resolution of overlapping spectra by harmonic detection and the advantages gained by performing detection at the higher harmonics, e.g., sixth and eighth. …
Experimental Investigation Of Long-Lived "Zeke" Rydberg States In Ultracold Argon, Gambhir Ranjit
Experimental Investigation Of Long-Lived "Zeke" Rydberg States In Ultracold Argon, Gambhir Ranjit
Physics Theses & Dissertations
There is considerable interest in the dynamics of ultracold plasmas and ultracold Rydberg gases. Ultracold plasmas are typically formed by photo-excitation of ultracold atoms to an energy region near (both above and below) an ionization threshold. Excitation to bound, highly-excited Rydberg states can lead to formation of a plasma via several processes, including collisions between Rydberg atoms. Three-body recombination in an ultracold plasma can also result in the production of ultracold Rydberg atoms. Understanding the dynamics of ultracold Rydberg gases is therefore important for understanding the dynamics of ultracold plasmas. In this dissertation, we have investigated the formation and survival …