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Diatomic Carbon Measurements With Laser-Induced Breakdown Spectroscopy, Michael Jonathan Witte
Diatomic Carbon Measurements With Laser-Induced Breakdown Spectroscopy, Michael Jonathan Witte
Masters Theses
In this thesis, investigation of well-known carbon Swan spectra is of primary interest. Combustion processes and/or explosion of hydrocarbon fuels cause occurrence of the Swan band system that originates from diatomic carbon. Physical characteristics of low-temperature stars and the interstellar medium can also reveal the Swan bands. The diatomic carbon molecule shows that its lowest rotational levels are sensitive to temperature variation, and higher rotational levels are sensitive to the surrounding gas density and the radiation field. In addition, carbon is a crucial element for life and is the 4th most abundant element; therefore, it is important to ascertain accurately …
Testing A Novel Technique To Improve Aluminum-26 Accelerator Mass Spectrometry Measurements For Earth Science Applications, Meghan Sarah Janzen
Testing A Novel Technique To Improve Aluminum-26 Accelerator Mass Spectrometry Measurements For Earth Science Applications, Meghan Sarah Janzen
Masters Theses
The measurement of cosmogenic 26Al [aluminum-26] in geological samples by accelerator mass spectrometry (AMS) is typically conducted on Al2O3 [aluminum oxide] targets. However, Al2O3 is not an ideal source material because it does not form a prolific beam of Al- [negative atomic aluminum ions] required for measuring low-levels of 26Al. This thesis presents the performance of AlN [aluminum nitride], AlF3 [aluminum fluoride] and mixed AlN + Al2O3 as novel alternative source materials for the analysis of 26Al. A negative ion cesium sputtering source at the Holifield …