Date of Award
Doctor of Philosophy
Physics and Astronomy
D. W. Lynch
Electron beam induced decompositions of alkali halides were studied. Compositional and topological changes induced by low-energy electron irradiation have been observed on thin films and single crystals of alkali-halides using scanning electron microscopy (SEM) and Auger electron microscopy (SAM). Alkali-metal rich structures with diameters of up to several microns were found on the sample surfaces;The temperature dependence of desorption yields were measured using a mass-spectrometer. We observed two temperature regions, each features a different activation Oil, Gas, and Energy;Temperature dependence of electron induced decomposition of CaF2 was studied using Auger spectroscopy and Energy dispersive x-ray (EDX) analysis. We observed that the decrease of surface concentration of F due to desorption does not depend on temperature while the decrease of bulk concentration does, and the activation energy of this process was measured.
Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/
Dou, Qun, "Electron beam decompositions of ionic crystals " (1989). Retrospective Theses and Dissertations. 9118.