https://doi.org/10.1351/goldbook.S05695
Oxygen molecule (dioxygen), O2, in an excited @S05699@. The @G02704@ of O2 is a triplet (\(^{3}\Sigma_{\rm{g}}^{-}\)). The two @M03872@ singlet states derived from the ground-state configuration are \(^{1}\Delta_{\rm{g}}\) and \(^{1}\Sigma_{\rm{g}}^{+}\) (the latter with the higher energy).
Notes:
- Use of the term singlet oxygen alone, without mention of the chemical species is discouraged since it can also refer to an oxygen atom in a \(^{1}\rm{S}\) or \(^{1}\rm{D}\) @E02257@. The oxygen atom @G02704@ is a triplet \(^{3}\rm{P}\) state and the \(^{1}\rm{S}\) and \(^{1}\rm{D}\) states are also derived from the ground-state configuration.
- @T06503-1@ @Q05007@ by triplet dioxygen (i.e., a process of @P04652@) is the most common procedure for the production of singlet molecular dioxygen in solution. For many chemical species, the efficiency with which the @T06503-2@ is quenched by triplet dioxygen and, independently, the efficiency with singlet molecular dioxygen is produced, is controlled by the spin-@R05175@.