field emission
1
7.8
- noun
- Specialized
:
emisión de campo
- The field emission phenomenon is crucial for the development of high-performance electron microscopes.
Examples
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In a vacuum, field emission occurs when a strong electric field causes electrons to be released from a material's surface.
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Electronic feedback kept the tip-to-sample distance constant by repeatedly monitoring the field-emission current between the two for a given tip-sample bias as the surface moved laterally underneath.
Academic text (2006) -
The cold field emission microscope eliminates the conventional electron source that illuminates the sample.
Academic text (2000) -
Young attached a sharp field-emission tip to the vertical z-leg of a piezoelectric-controlled tripod.
Academic text (2006) -
He studied vacuum tunneling of electrons from the tip to the surface, but published only topographic scans taken using field emission.
Academic text (2006) -
Cold field emission micrograph of tinopal tracer residue showing distinctive, fiberlike crystals.
Academic text (2000) -
Although this resolution limit precluded seeing surface atoms, field emission still provides an electron source in many practical applications, often using tungsten tips coated with zirconium oxide.
Academic text (2006) -
Researchers are studying field emission to improve the efficiency of electron sources in advanced imaging technologies.
Surface Forms
Morphology
The constituents 'field' (a region of force) and 'emission' (a release) combine to yield the general idea 'a release caused by a field', so a learner who knows both words can grasp the basic sense. However, the precise technical meaning — electrons emitted from a material surface in vacuum under a strong electric field — is domain-specific and not fully predictable from the words alone, making the term only partially transparent.
Etymology
Field emission paints a simple picture: a strong electric field pulls tiny 'electrons' off a material's 'surface', like wind blowing dust from a table. So emission here means the 'sending out' or 'release' of those 'electrons', which is why the term means the 'release' of electrons by a strong field.