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Full-Text Articles in Physical Sciences and Mathematics
Increasing The Corrected Field Of View Of An Adaptive Optical Telescope, Dustin C. Johnston
Increasing The Corrected Field Of View Of An Adaptive Optical Telescope, Dustin C. Johnston
Theses and Dissertations
Current adaptive optical telescope designs use a single deformable mirror (DM) to compensate for atmospheric distortion. The corrected field of view (FOV) of an adaptive optics system could be increased through the use of multiple DMs optically conjugated to corresponding planes which sample the turbulence region in altitude. Often, the atmospheric turbulence responsible for the degradation of telescope images is concentrated in several layers. Each DM would correct for the component of the total wavefront in the pupil contributed by one or more layers. If the atmosphere does not possess a layered structure, the best fit of the turbulence profile …
Collisional Detachment Of Anions Using Fourier Transform Mass Spectrometry, Kevin B. Riehl
Collisional Detachment Of Anions Using Fourier Transform Mass Spectrometry, Kevin B. Riehl
Theses and Dissertations
Fourier Transform Mass Spectrometry (FTMS) is used to make energy resolved ion-neutral reaction measurements at high translational energies (up to several hundred eV). The technique is demonstrated for collisional detachment of anions, and should be easily applied to other inelastic reactions. Collisional detachment cross sections of iodine anions onto gas phase targets of neon, xenon, and trifluoromethyl iodide are measured for 1-300 eV (lab frame). Peak detachment cross sections are roughly 2, 8.5, and 7 Å2, respectively. Ion kinetic measurements show the iodine anion is unreactive in trifluoromethyl iodide at thermal energies. Positive ion chemistry is consistent with …