The Interstellar Boundary Explorer (IBEX) is a satellite which detects energetic neutral atoms in space. The IBEX-Lo detector features a tetrahedral amorphous carbon conversion surface. A procedure was developed to hydrogen terminate the facets making up the conversion surface such that the root mean square roughness did not exceed 0.5nm per 1micro m x 1microm surface area. A remote plasma electron cyclotron resonance chemical vapor deposition technique was used for the hydrogen termination, and ultraviolet photoemission spectroscopy, x-ray photoemission spectroscopy, and atomic force microscopy were used to characterize the surface. After the H-termination, the oxygen peak in the XPS spectrum was not detectable, indicating removal of the adsorbed oxygen layer. Additionally, the vacuum cutoff of the UPS spectrum was lowered, and a large peak appeared near the vacuum cutoff, indicating a negative electron affinity and the presence of hydrogen.For both blunt and sharp tips, h1 = 0.8I¼m and h2 = 0.3I¼m respectively. The structures were arranged in a regular hexagonal pattern on the surface of the emitter such that the tips were 5I¼m apart from their nearest neighbor, measured from theanbsp;...
|Title||:||Thermionic Energy Conversion and Particle Detection Using Diamond and Diamond-like Carbon Surfaces|
|Author||:||Joshua Ryan Smith|
|Publisher||:||ProQuest - 2007|