Proton Affinity
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High Quality Content by WIKIPEDIA articles! The proton affinity, Epa, of a anion or of a neutral atom or molecule is a measure of its gas-phase basicity. It is the energy released in the following reactions: A + H+ HA B + H+ BH+ These reactions are always exergonic in the gas phase, i.e. energy is released when the reaction advances in the direction shown. However, proton affinities are conventionally quoted with the opposite sign convention from most other thermodynamic properties, a positive Epa indicating an intake of energy by the system. This is the same sign convention as is used for electron affinity.…mehr

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High Quality Content by WIKIPEDIA articles! The proton affinity, Epa, of a anion or of a neutral atom or molecule is a measure of its gas-phase basicity. It is the energy released in the following reactions: A + H+ HA B + H+ BH+ These reactions are always exergonic in the gas phase, i.e. energy is released when the reaction advances in the direction shown. However, proton affinities are conventionally quoted with the opposite sign convention from most other thermodynamic properties, a positive Epa indicating an intake of energy by the system. This is the same sign convention as is used for electron affinity.