Preferred Label : singlet molecular oxygen;
Detailed label : singlet molecular oxygen (singlet molecular dioxygen);
IUPAC definition : Oxygen molecule (dioxygen), O sub 2 /sub , in an excited singlet state. The ground
state of O sub 2 /sub is a triplet (3Σg-). The two metastable singlet states derived
from the ground-state configuration are 1Δg and 1Σg (the latter with the higher energy).;
Scope note : triplet state quenching by triplet dioxygen (i.e., a process of photosensitization)
is the most common procedure for the production of singlet molecular dioxygen in solution.
for many chemical species, the efficiency with which the triplet state is quenched
by triplet dioxygen and, independently, the efficiency with singlet molecular dioxygen
is produced, is controlled by the spin-statistical factor.; 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 a1s or 1d excited state.
the oxygen atom ground state is a triplet3pstate and the1s and 1d states are also
derived from the ground-state configuration.;
Origin ID : S05695;
See also
Oxygen molecule (dioxygen), O sub 2 /sub , in an excited singlet state. The ground
state of O sub 2 /sub is a triplet (3Σg-). The two metastable singlet states derived
from the ground-state configuration are 1Δg and 1Σg (the latter with the higher energy).
