free electron

The topic free electron is discussed in the following articles:

electrical conduction

  • TITLE: materials testing
    SECTION: Measurement of electrical properties
    Electrical conductivity involves a flow or current of free electrons through a solid body. Some materials, such as metals, are good conductors of electricity; these possess free or valence electrons that do not remain permanently associated with the atoms of a solid but instead form an electron “cloud” or gas around the peripheries of the atoms and are free to move through the solid...
  • TITLE: electricity (physics)
    SECTION: Basic phenomena and principles
    Figure 12 shows a wire made of a conducting material such as copper. By some external means, an electric field is established inside the wire in a direction along its length. The electrons that are free to move will gain some speed. Since they have a negative charge, they move in the direction opposite that of the electric field. The current i is defined to have a positive value in the...


  • TITLE: spectroscopy (science)
    SECTION: Resonance-ionization spectroscopy
    ...sensitive and highly selective analytical measurement method. It employs lasers to eject electrons from selected types of atoms or molecules, splitting the neutral species into a positive ion and a free electron with a negative charge. Those ions or electrons are then detected and counted by various means to identify elements or compounds and determine their concentration in a sample. The RIS...
  • TITLE: radiation measurement (technology)
    SECTION: Gas-filled detectors carries a net positive electric charge and is called a positive ion. The other member of the ion pair is the electron that is no longer bound to a specific atom and is known as a free electron. Most free electrons are formed with low kinetic energy, and they simply diffuse through the gas, taking part in the random thermal motion of all the atoms. Some free electrons are...


  • TITLE: semiconductor device (electronics)

solar cells

  • TITLE: solar cell (electronics)