https://doi.org/10.1351/goldbook.P04907
The negative of the
enthalpy
change in the gas phase reaction (real or hypothetical) between a proton
(more appropriately hydron
) and the chemical species
concerned, usually an electrically neutral species to give the conjugate acid
of that species. Proton
affinity is often, but unofficially, abbreviated as PA.See also:
gas-phase basicity