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Electron cyclotron resonance is a phenomenon observed in plasma physics, condensed matter physics, and accelerator physics. An electron in a static and uniform magnetic field will move in a circle due to the Lorentz force. The circular motion may be superimposed with a uniform axial motion, resulting in a helix, or with a uniform motion perpendicular to the field, e.g., in the presence of an electrical or gravitational field, resulting in a cycloid. The angular frequency (ω = 2π''f'' ) of this ''cyclotron'' motion for a given magnetic field strength ''B'' is given (in SI units)〔In SI units, the elementary charge ''e'' has the value 1.602×10−19 coulombs, the mass of the electron ''m'' has the value 9.109×10−31 kilograms, the magnetic field ''B'' is measured in teslas, and the angular frequency ω is measured in radians per second.〕 by :. where is the elementary charge and is the mass of the electron. For the commonly used microwave frequency 2.45 GHz and the bare electron charge and mass, the resonance condition is met when ''B'' = 875 G = 0.0875 T. For particles of charge ''q'', rest mass ''m''0 moving at relativistic speeds ''v'', the formula needs to be adjusted according to the special theory of relativity to: : where :. ==In plasma physics== An ionized plasma may be efficiently produced or heated by superimposing a static electron cyclotron emission can be used as a Plasma diagnostics 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「electron cyclotron resonance」の詳細全文を読む スポンサード リンク
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