photo-electron

A scientist observes a photo-electron in a vacuum tube experiment.

Definition

1. Noun:
   • An electron emitted from a material due to the photoelectric effect: A "photo-electron" is an electron that is ejected from a surface (usually a metal) when light of a sufficient frequency strikes it. This phenomenon is the basis of the photoelectric effect, explained by Albert Einstein.

Usage Examples

• Noun:
  • The experiment measured the kinetic energy of each photo-electron emitted from the metal plate. (The energy of electrons released by light was studied.)
  • Einstein's theory of the photoelectric effect predicts that the number of photo-electrons depends on the light's intensity. (The quantity of emitted electrons is related to light brightness.)

Advanced Usage

• "Photo-electron spectroscopy": a technique used to study the electronic structure of materials by analyzing the energy of photo-electrons.

  • Researchers used photo-electron spectroscopy to examine the surface composition of the alloy. (A method involving emitted electrons to analyze material surfaces.)

• "Photo-electron yield": the number of electrons emitted per incident photon.

  • The photo-electron yield increased when ultraviolet light was used. (The efficiency of electron emission rose with UV light.)

Variants and Related Words

• Photoelectron (n): a single spelling variation (often written as one word without a hyphen).

  • The photoelectron current was measured with a sensitive ammeter. (The flow of emitted electrons was recorded.)

• Photoemission (n): the process of emitting photo-electrons.

  • Photoemission occurs when light energy exceeds the material's work function. (The release of electrons from light exposure.)

Synonyms

• Ejected electron: an electron that is forced out of a material.
• Liberated electron: an electron freed from its atomic bond.

Related Idioms

• No direct idioms: "photo-electron" is a technical term, not used in idiomatic expressions.

Phrasal Verbs

• No phrasal verbs: "photo-electron" is not used with phrasal verbs.

Related Concepts

• Work function: the minimum energy needed to remove an electron from a solid, directly related to photo-electron emission.
  • A material with a low work function produces more photo-electrons under visible light. (The threshold for electron release is lower.)