photoemission
Definition
Noun: * The emission of electrons from a surface (especially a metal) upon exposure to electromagnetic radiation, such as visible light or ultraviolet light. This is a physical phenomenon where light energy causes electrons to be ejected from a material.
Usage
- "Photoemission" is a technical, scientific term used primarily in physics, chemistry, and materials science.
- It is an uncountable noun referring to the process or phenomenon itself.
- It is often used in compound terms that describe specific techniques or measurements, such as "photoemission spectroscopy."
Examples
- The experiment studied the photoemission properties of the new semiconductor material.
- Photoemission is the fundamental principle behind the operation of photomultiplier tubes and some types of solar cells.
- Scientists used ultraviolet photoemission spectroscopy to analyze the electronic structure of the surface.
Advanced Usage
- Angle-resolved photoemission spectroscopy (ARPES): A specialized technique that measures not only the energy of emitted electrons but also their direction, providing detailed maps of a material's electronic band structure.
- X-ray photoemission spectroscopy (XPS): A surface-sensitive technique that uses X-rays to probe the elemental composition and chemical states of a material.
Variants and Related Words
- Photoelectron (noun): An electron emitted from a substance by the photoelectric effect.
- Photoemissive (adjective): Describing a material capable of or relating to photoemission (e.g., a photoemissive cathode).
- Photoelectric effect (noun): The broader physical phenomenon encompassing photoemission, where light interacts with matter to emit electrons or change electrical properties.
Synonyms
- Photoelectric emission
Related Phrases / Compounds
- Photoemission spectroscopy (PES): A family of analytical techniques based on the photoemission process.
- Photoemission yield: A measure of the efficiency of the photoemission process.
Noun
-
an emission of photoelectrons (especially from a metallic surface)
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