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Τι (ποιος) είναι free electrons - ορισμός
WIKIMEDIA DISAMBIGUATION PAGE
Free electron gas; Free electrons; Free electron (disambiguation)
Free-electron laser
![Schematic representation of an [[undulator]], at the core of a free-electron laser.](https://commons.wikimedia.org/wiki/Special:FilePath/FEL principle.png?width=200 "Schematic representation of an [[undulator]], at the core of a free-electron laser.")
TYPE OF LASER
XFEL; X-ray free-electron laser; Free electron laser
A free-electron laser (FEL) is a (fourth generation) light source producing extremely brilliant and short pulses of radiation. An FEL functions and behaves in many ways like a laser, but instead of using stimulated emission from atomic or molecular excitations, it employs relativistic electrons as a gain medium.
Free electron model
![In three dimensions, the [[density of states]] of a gas of [[fermion]]s is proportional to the square root of the kinetic energy of the particles.](https://commons.wikimedia.org/wiki/Special:FilePath/Free-electron DOS.svg?width=200 "In three dimensions, the [[density of states]] of a gas of [[fermion]]s is proportional to the square root of the kinetic energy of the particles.")
A SIMPLE MODEL FOR THE BEHAVIOUR OF VALENCE ELECTRONS IN A CRYSTAL STRUCTURE OF A METALLIC SOLID
Free-Electron Model of Metals; Free-electron theory of metals; Drude-Sommerfeld model; Drude–Sommerfeld model; Free-electron theory; Free electron theory; Free-electron model
In solid-state physics, the free electron model is a quantum mechanical model for the behaviour of charge carriers in a metallic solid. It was developed in 1927, principally by Arnold Sommerfeld, who combined the classical Drude model with quantum mechanical Fermi–Dirac statistics and hence it is also known as the Drude–Sommerfeld model.
Free Negro
NON-SLAVE BLACK PERSON IN PRE-EMANCIPATION USA
Free Negroes; Free African American; Free black; Free African-American; Free blacks; Free negroes; Free negro; Free Blacks; Free Black
In the British colonies in North America and in the United States before the abolition of slavery in 1865, free Negro or free Black described the legal status of African Americans who were not enslaved. The term was applied both to formerly enslaved people (freedmen) and to those who had been born free (free people of color).
Βικιπαίδεια
Free electron
Free electron in physics may refer to:
- Electron, as a free particle
- Solvated electron
- Charge carrier, as carriers of electric charge
- Valence electron, as an outer shell electron that is associated with an atom
- Valence and conduction bands, as a conduction band electron relative to the electronic band structure of a solid
- Fermi gas, as a particle of a non-interacting electron gas
- Free electron model, as a particle in the Drude-Sommerfeld model of metals
- Free-electron laser, as a particle in the electron beam
