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Gain-switching — is a technique in optics by which a laser can be made to produce pulses of light of extremely short duration, of the order of picoseconds (10 12s).In a semiconductor laser, the optical pulses are generated by injecting a large number of carriers… … Wikipedia
Règle des 18 électrons — La règle des 18 électrons est principalement utilisée dans la chimie des métaux de transition, pour caractériser et prévoir la stabilité des complexes métalliques. La couche de valence d un métal de transition peut accueillir 18 électrons :… … Wikipédia en Français
Tube photo-multiplicateur d'électrons — Photomultiplicateur Pour les articles homonymes, voir PM. Le photomultiplicateur (PM) est un dispositif permettant la détection de photons. Il se présente sous la forme d un tube électronique. Sous l’action de la lumière, des électrons sont… … Wikipédia en Français
chemical compound — Introduction any substance composed of identical molecules consisting of atoms (atom) of two or more chemical elements (chemical element). All the matter in the universe is composed of the atoms of more than 100 different chemical elements … Universalium
Electrochemistry — is a branch of chemistry that studies chemical reactions which take place in a solution at the interface of an electron conductor (a metal or a semiconductor) and an ionic conductor (the electrolyte), and which involve electron transfer between… … Wikipedia
Ion — Cation and Anion redirect here. For the particle physics/quantum computing concept, see Anyon. For other uses, see Ion (disambiguation). Hydrogen atom (center) contains a single proton and a single electron. Removal of the electron gives a cation … Wikipedia
Bohr model — In atomic physics, the Bohr model created by Niels Bohr depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus mdash;similar in structure to the solar system, but with… … Wikipedia
Chemistry — For other uses, see Chemistry (disambiguation). Chemistry is the science of atomic matter (that made of chemical elements), its properties, structure, comp … Wikipedia
Reduction potential — (also known as redox potential, oxidation / reduction potential, ORP or Eh) is a measure of the tendency of a chemical species to acquire electrons and thereby be reduced. Reduction potential is measured in volts (V), or millivolts (mV). Each… … Wikipedia
carbon group element — ▪ chemical elements Introduction any of the five chemical elements that make up Group 14 (IVa) of the periodic table namely, carbon (C), silicon (Si), germanium (Ge), tin (Sn), and lead ( … Universalium
Ionic bond — [ noble gas electron configuration, and this electron enters the chlorine atom exothermically. The oppositely charged ions are then attracted to each other, and their bonding releases energy. The net transfer of energy is that energy leaves the… … Wikipedia