THE MECHANISM OF OXIDE FORMATION IN THE INITIAL STAGES OF OXIDATION
OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS
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Research was conducted on the mechanism of oxide formation by means of a field emission microscope with a tungsten emission tip. Changes in the emission were observed as a result of adsorption of residual gases on the emission tip at room temperature. An improvement was made in the technique for producing field emission tubes by the development of a refractory masking material for pyrex. The high-vacuum technique was refined by the addition of a second getter to the system and the use of a H-purge at elevated temperatures to decontaminate the isolation trap. As adsorption increased the following changes were observed in emission pattern 1 a gradual decrease followed by an increase in total integrated emission intensity 2 a gradual decrease followed by an increase in local emission intensity of the area around 111 regions bounded by 211 regions 3 an initial increase followed by a decrease in the size of the lowintensity regions around 110 and 211 and 4 an initial decrease followed by an increase in the size of the low intensity regions around 100.