Electron affinity molecules

Figure 3. Definition of the ionization energy I for an isolated atom (A) and an atom in a molecule (B). In the first case, the electron is moved to infinite distance and does not interact with the cation. In the latter case, the charge of the electron is distributed in the vicinity of the cation. This results in a deformation of the electron cloud (in this case a tetrahedral one). The definition of an atom-in-molecule electron affinity is analogous.

The trend in oxidation potentials may be considered a composite trend, similar to that described for the E° values of the alkali metals (Chap. 6). For the halogens, the following quantities are involved heats of dissociation of the molecules, electron affinities of the atoms, hydration energies of the ions, heats of vaporization (for bromine and iodine only), and, finally, entropy or randomness effects. Aside from the entropy effects (which turn out to be quite small for the reactions being considered), the reduction of the halogen X to the hydrated ion X at room temperature may be represented in steps as follows ... 

Molecule Electron affinity in eV Uncertainty in eV Method Ref. Molecule Electron affinity in eV Uncertainty in eV Method Ref. 

The energy threshold value can be well predicted by the electron transfer mechanism, and it seems to be closely related to the (lower) value of the target molecule electron affinity. 

Molecule Electron Affinity ineV Uncertainty ineV Method Ref. 

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