Preferred Label : singlet–triplet crossing;
IUPAC definition : Point of intersection between the potential energy surfaces of states of different
multiplicity.;
Scope note : the intersection belongs to a (3n7)-dimensional subspace of the (3n6)-dimensional
nuclear coordinate space and therefore appears as a line on a two-dimensional energy
surface (nis the number of nuclei). in this case the branching plane is one-dimensional
and is defined by the gradient difference vector x1.;
Origin ID : ST07477;
See also
Point of intersection between the potential energy surfaces of states of different
multiplicity.
