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Field emitter is an important cathode to probe atomic structures of large unit-cell crystal samples by electron imaging and diffraction experiments because of the capability to produce high brightness electron beam with a large transverse coherence length. Despite the small energy spread, normally only the near-axis part of the beam is utilized because of the large geometrical angular spread at the...
We have observed much variety of field emission microscopy (FEM) patterns from C60 molecules, including patterns that are much larger than the geometrical shape of C60 and very similar to those of simple atomic orbitals. It has been reported that C60 possesses unoccupied super atomic molecular orbitals (SAMOs) on the basis of theoretical investigations and experimental observations by means of scanning...
The paper describes electrical noise of experimental field emission cathodes based on “polymer” pencil leads which have a high content of hybridized carbon with a low degree of surface oxidation and silicon monoxide (SiO). Charge transport within experimental samples is evaluated based on results provided by the noise spectroscopy method. The paper also briefly describes the experimental preparation...
In this work, a p-Si field emitter array produced by wafer dicing is presented. Different strategies to produce a variety of shapes of the tips are shown. The resulting arrays show excellent emission characteristics compared to other field emitter, like carbon nano tubes.
Field electron emission patterns emitted from few-layer graphene with different edge morphology were investigated using field emission microscopy (FEM). The FEM image of few-layer graphene was observed as a “lantern”, which is composed of light and dark fringes. The relationship between graphene edge morphology and field emission pattern was investigated using a emission electron spatial interference...
Nitrogen-incorporated ultrananocrystalline diamond, (N)UNCD, is an unconventional field emitter that performs in planar thin film configuration and has turn-on fields on the order of 10 V/ m. To shed more light on fundamental field emission properties of (N)UNCD, we have designed and commissioned a field emission microscope (FEM). The microscope can directly image the field emission site distribution...
Magnification of an electrostatic divergent lens with extremely short gap spacing was investigated with computer simulation. The present study focused on the dependence of the magnification on the electrode spacing. The numerical solution showed a relatively good agreement with the analytical value when the ratio of the aperture diameter to the electrode spacing was less than unity. The magnification...
In this paper we demonstrate how the magnetic field influences the trajectory of an electron beam in a miniature transmission electron microscope integrated with an ion-sorption micropump utilizing strong permanent magnets. Simulations of the electron trajectories (COMSOL software) and experimental results (spots on ITO screen) are compared. It is discussed how to eliminate the negative effect of...
Local emission characteristics of the microscopic emission sites on a surface of large area field emitters is one of the most important factors which establish the macroscopic emission properties. This work is aimed to evaluate the local field emission characteristics using computerized field emission projector and technique of multi-channel recording of IVCs. The model sample is nanocomposite nanotubes...
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