photoemission

Thân thiện

A scientist observes photoemission in a vacuum chamber.

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.

Học thuật

Noun

1. an emission of photoelectrons (especially from a metallic surface)