conversion photon-électron

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• Electron-positron annihilation — occurs when an electron and a positron (the electron s anti particle) collide. The result of the collision is the conversion of the electron and positron and the creation of gamma ray photons or, less often, other particles. The process must… …   Wikipedia

• Conversion interne — La conversion interne est un mode de désintégration radioactive par lequel un électron acquérant directement l énergie d excitation d un noyau atomique s en trouve expulsé de l atome. Il y a donc émission d un électron énergétique, mais en dehors …   Wikipédia en Français

• Photon — This article is about the elementary particle of light. For other uses, see Photon (disambiguation). Photon Photons emitted in a coherent beam from a laser Composition Elementary particle …   Wikipedia

• Electron volt — In physics, the electron volt (eV) is a unit of energy. By definition, it is equal to the amount of energy gained by a single unbound electron when it accelerates through an electrostatic potential difference of one volt. In SI units, it is the… …   Wikipedia

• Électron-volt — En physique, l électron volt[1] (symbole eV) est une unité de mesure d énergie. Sa valeur est définie comme étant l énergie cinétique d un électron accéléré depuis le repos par une différence de potentiel d un volt. Un électron volt est donc égal …   Wikipédia en Français

• electron — One of the negatively charged subatomic particles that orbit the positive nucleus, in one of several energy levels called shells; in mass they are estimated to be 1/1836.15 of a proton; when emitted from inside the nucleus of a radioactive… …   Medical dictionary

• Internal conversion — This article is about the nuclear process. For the chemical process, see Internal conversion (chemistry). Internal conversion is a radioactive decay process where an excited nucleus interacts with an electron in one of the lower atomic orbitals,… …   Wikipedia

• Internal conversion (chemistry) — Internal conversion is a transition in from a higher to a lower electronic state in a molecule. It is sometimes called radiationless de excitation , because no photons are emitted. It differs from intersystem crossing in that, while both are… …   Wikipedia

• internal conversion — in decay of an isomer, transition between two nuclear energy states not characterized by emission of a photon because the energy is instead transferred to an inner orbital electron, which is ejected from the atom …   Medical dictionary

• TÉLÉCOMMUNICATIONS - Transmissions optiques — Le développement des télécommunications s’est caractérisé par l’utilisation d’un domaine de fréquences de plus en plus vaste, depuis les quelques kilohertz des premières lignes téléphoniques jusqu’à la centaine de gigahertz des guides d’ondes… …   Encyclopédie Universelle

• radiation measurement — ▪ technology Introduction       technique for detecting the intensity and characteristics of ionizing radiation, such as alpha, beta, and gamma rays or neutrons, for the purpose of measurement.       The term ionizing radiation refers to those… …   Universalium