“electron affinity”的概念、定义、翻译、参考文献-科学参考

electron affinity

Physics

Symbol A. The energy change occurring when an atom or molecule gains an electron to form a negative ion. For an atom or molecule X, it is the energy released for the electron-attachment reaction

$X (g) + e \to X^{-} (g)$

Often this is measured in electronvolts. Alternatively, the molar enthalpy change, Δ‎H, can be used.

Chemistry

The energy change occurring when an atom or molecule gains an electron to form a negative ion. For an atom or molecule X, it is the energy released for the electron-attachment reaction
$X (g) + e \to X^{-} (g)$
Often this is measured in electronvolts. Alternatively, the molar enthalpy change, Δ‎H, can be used.

Electronics and Electrical Engineering

1. (symbol: A or E_a; unit: electronvolt) The energy released when an electron becomes attached to an atom or molecule to form a negative ion. Many atoms or molecules have a positive electron affinity, i.e. the negative ion is more stable than the neutral species.
2. (symbol: χ; unit: electronvolt) The difference in energy between the bottom of the conduction band, E_c, in a semiconductor and the vacuum level, i.e. the energy of free space outside the semiconductor. Compare work function.

单词	electron affinity
释义	electron affinity Physics Symbol A. The energy change occurring when an atom or molecule gains an electron to form a negative ion. For an atom or molecule X, it is the energy released for the electron-attachment reaction $X (g) + e \to X^{-} (g)$ Often this is measured in electronvolts. Alternatively, the molar enthalpy change, Δ‎H, can be used. Chemistry The energy change occurring when an atom or molecule gains an electron to form a negative ion. For an atom or molecule X, it is the energy released for the electron-attachment reaction $X (g) + e \to X^{-} (g)$ Often this is measured in electronvolts. Alternatively, the molar enthalpy change, Δ‎H, can be used. Electronics and Electrical Engineering 1. (symbol: A or E_a; unit: electronvolt) The energy released when an electron becomes attached to an atom or molecule to form a negative ion. Many atoms or molecules have a positive electron affinity, i.e. the negative ion is more stable than the neutral species. 2. (symbol: χ; unit: electronvolt) The difference in energy between the bottom of the conduction band, E_c, in a semiconductor and the vacuum level, i.e. the energy of free space outside the semiconductor. Compare work function.
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