A unit of energy. Symbol: eV. Although units of energy include the calorie and joule, these are inconveniently large when used to describe phenomena related to a single atom or molecule, so the unit electron volt is usually used. It is the energy required for a charged particle with a unit charge, such as an electron, to move from a resting state across a potential difference of 1 V without hindrance. For convenience, 10 3 electron volts are abbreviated as keV, 10 6 electron volts as MeV, and 10 9 electron volts as GeV. The energy required to remove an electron from a hydrogen atom is 13.6 eV, and the radioactive isotope cobalt-60 emits gamma rays with energies of 1.17 and 1.13 MeV. Conversion to joules (J) depends on the accuracy of the measurement of the elementary charge, but Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition |
エネルギーの単位.記号 eV.エネルギーの単位としてカロリーやジュールがあるが,単一の原子・分子に関する現象を述べるには,あまりにも大きすぎて不便であるので,通常,電子ボルトという単位が使用されている.単位電荷をもった荷電粒子,たとえば1個の電子が静止状態から出発して1 V の電位差間を妨害を受けずに移動するときに必要なエネルギー.便宜上,103 電子ボルトを keV,106 電子ボルトをMeV,109 電子ボルトを GeV と略記する.水素原子から電子を取り去るのに要するエネルギーは13.6 eV,また放射性同位体のコバルト60は1.17および1.13 MeV のエネルギーをもったγ線を放出する.ジュール(J)への換算は電荷素量の測定の精度に依存するが, 出典 森北出版「化学辞典(第2版)」化学辞典 第2版について 情報 |
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