photoelectron

Thân thiện

A scientist observes photoelectrons in a vacuum chamber.

Definition

Noun: * An electron that is ejected from an atom, molecule, or solid material (like a metal surface) when it absorbs energy from an incident photon (a particle of light). This process is the fundamental principle behind the photoelectric effect.

Usage

The term is used primarily in the fields of physics, chemistry, and materials science to describe the particle resulting from the photoelectric effect. * It functions as a countable noun (e.g., a photoelectron, many photoelectrons). * It is often modified by adjectives describing its properties, such as energetic, emitted, or secondary.

Examples

• The energy of the emitted photoelectron depends on the frequency of the incoming light.
• Scientists analyzed the photoelectrons to determine the material's electronic structure.
• In the experiment, a photon strikes the metal surface, releasing a single photoelectron.

Advanced Usage

• Photoelectron Spectroscopy (PES): An analytical technique that measures the kinetic energy of photoelectrons to study the composition and electronic states of a material's surface.
  • X-ray photoelectron spectroscopy (XPS) is a common surface analysis method.
• Photoelectron Angular Distribution: The pattern in which photoelectrons are emitted, which provides information about the symmetry of the molecular orbital from which the electron originated.

Variants and Related Words

• Photoelectric (adjective): Relating to or involving the emission of electrons by light.
  • The photoelectric effect was explained by Albert Einstein.
• Photoemission (noun): The phenomenon or process of emitting photoelectrons.
  • The efficiency of photoemission depends on the material.

Synonyms

• Ejected electron
• Photoemitted electron

(Note: There are no common idioms or phrasal verbs associated with this specific technical term.)

Học thuật

Noun

1. an electron that is emitted from an atom or molecule by an incident photon