https://doi.org/10.1351/goldbook.ST07477

Point of intersection between the potential energy surfaces of states of different multiplicity.

The intersection belongs to a (\(3\ N-7\))-dimensional subspace of the (\(3\ N-6\))-dimensional nuclear coordinate space and therefore appears as a line on a two-dimensional energy surface (\(N\) is the number of nuclei). In this case the @BT07335@ is one-dimensional and is defined by the @G02669@ difference vector \(x_{1}\).

**Note:**

The intersection belongs to a (\(3\ N-7\))-dimensional subspace of the (\(3\ N-6\))-dimensional nuclear coordinate space and therefore appears as a line on a two-dimensional energy surface (\(N\) is the number of nuclei). In this case the @BT07335@ is one-dimensional and is defined by the @G02669@ difference vector \(x_{1}\).