Location

Jereld R. Nicholson Library

Subject Area

Physics

Description

Electron emitters are essential components in many microscopy systems, including scanning electron microscopes, transmission electron microscopes, and scanning Auger microscopes. One feature of good electron emitter materials is a low surface work function. CeB6 is one such material. Line defects seen in CeB6 affect the work function of the emitting surface, causing the emitted electrons to have a wider spread of energies. This causes chromatic aberration, reducing the resolution of the microscope systems. The purpose of this research is to find the source of these line defects in the CeB6 emitter fabrication process. It was suspected that defects were in the form of oxides deposited from water contamination.This study confirms that the defects do contain more oxygen than other areas of the surface. The source of this oxygen has yet to be determined.

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May 16th, 4:30 PM May 16th, 6:00 PM

Line Defects in Single Crystal CeB6 Electron Emitters

Jereld R. Nicholson Library

Electron emitters are essential components in many microscopy systems, including scanning electron microscopes, transmission electron microscopes, and scanning Auger microscopes. One feature of good electron emitter materials is a low surface work function. CeB6 is one such material. Line defects seen in CeB6 affect the work function of the emitting surface, causing the emitted electrons to have a wider spread of energies. This causes chromatic aberration, reducing the resolution of the microscope systems. The purpose of this research is to find the source of these line defects in the CeB6 emitter fabrication process. It was suspected that defects were in the form of oxides deposited from water contamination.This study confirms that the defects do contain more oxygen than other areas of the surface. The source of this oxygen has yet to be determined.

 

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