bond-dissociation energy (BDE) in theoretical chemistry
For a diatomic molecule, the maximum vibrational energy that a molecule can have prior to its decomposition into the ground electronic states of the constituent atoms (spectroscopic bond-dissociation energy, D e). The D e value is related to the chemical dissociation energy: D 0 = D e − E vib 0, where E vib 0 is zero-point vibrational energy. This definition is usually extended to the dissociation of polyatomic molecules into certain molecular fragments through homolytic or heterolytic bond cleavages.
PAC, 1999, 71, 1919 (Glossary of terms used in theoretical organic chemistry) on page 1928