Field Emission Mode
Field Emission Mode - Related Videos
06:58
Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization
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2016
A method for electrochemically etching field emission tips is presented. Etching parameters are characterized and the operation of the tips in field emission mode is investigated.
08:32
Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors
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Cited by 7 •
2013
A high-sensitivity photonic micro sensor was developed for electric field detection. The sensor exploits the optical modes of a dielectric sphere. Changes in the external electric field perturb the sphere morphology leading to shifts in its optical modes. The electric field strength is measured by monitoring these optical shifts.
08:18
Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions
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Cited by 13 •
2016
We have designed, developed, and implemented a novel full flow sampling system (FFS) for quantification of methane emissions and greenhouse gases from across the natural gas supply chain.
02:39
Emission Spectra
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2020
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present. In contrast to continuous spectra, light can also occur as discrete or line spectra having very narrow linewidths interspersed throughout the spectral regions. Exciting a gas at low partial pressure using an electrical current,...
09:16
High-resolution Patterning Using Two Modes of Electrohydrodynamic Jet: Drop on Demand and Near-field Electrospinning
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Cited by 12 •
2018
Here, we present a protocol to produce high-resolution conductive patterns using electrohydrodynamic (EHD) jet printing. The protocol includes two modes of EHD jet printing: the continuous near-field electrospinning (NFES) and the dot-based drop-on-demand (DOD) EHD printing.
FAQs
A strong electric field narrows the potential barrier at a material’s surface. Electrons can then pass through that barrier by quantum-mechanical tunneling rather than gaining enough thermal energy to cross it. This mechanism reduces the need for substantial heating and supports a controlled electron beam for electron-based instruments.
The electric field determines how strongly the surface potential barrier is narrowed. Under the strong-field condition required for emission, electrons can escape from the material and form a usable beam. Controlling this operating condition is important because the beam must support precise measurements, imaging, and surface characterization.
Field Emission Mode relies on quantum-mechanical tunneling through a field-narrowed surface barrier, whereas thermally driven escape would require electrons to receive substantial heat energy. Because field emission does not depend on substantial thermal heating, it provides an operating approach suited to instruments that require controlled beams for high-detail microscopy and material analysis.
The resulting electron beam combines high brightness with a small probe. High brightness supports sensitive electron-based measurements, while the small probe helps resolve fine regions of a specimen. Together, these characteristics make the mode useful for examining nanoscale features, engineered surfaces, and microstructures in engineering materials.
An instrument must establish a strong electric field at the emitting material’s surface and use the emitted electrons as a controlled beam. The beam can then support imaging or surface analysis, depending on the measurement goal. Maintaining this operating condition links the emission mechanism to the instrument’s resolution and sensitivity.
Engineers would select this mode when they need detailed information about nanoscale features, engineered surfaces, or material microstructures. Its high-brightness beam and small probe support high-resolution imaging, surface analysis, and characterization. These capabilities help evaluate how designed surfaces and fine structural features appear in electron-based measurements.