Branching plane

Term · Chemistry · MLC-T-CHM-001484

At a conical intersection, the two-dimensional subspace of nuclear coordinates defined by the gradient difference vector together with the interstate coupling vector. Displacement along either vector lifts the degeneracy of the two electronic states to first order, producing the double-cone shape of the intersection. Displacements in the remaining 3N-8 internal coordinates, orthogonal to this plane, preserve the degeneracy and trace out the intersection seam.

Table 1. Record
Identifier	MLC-T-CHM-001484
Field	Chemistry
Subject	Organic and Biomolecular Chemistry
References	PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 309 (https://doi.org/10.1351/pac200779030293)
See also	Adiabatic; Conical intersection; Chemical induction; Excited state; Gradient; Ground state

Record as JSON

{
  "id": "MLC-T-CHM-001484",
  "term": "Branching plane",
  "field": "Chemistry",
  "definition": "At a conical intersection, the two-dimensional subspace of nuclear coordinates defined by the gradient difference vector together with the interstate coupling vector. Displacement along either vector lifts the degeneracy of the two electronic states to first order, producing the double-cone shape of the intersection. Displacements in the remaining 3N-8 internal coordinates, orthogonal to this plane, preserve the degeneracy and trace out the intersection seam.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "adiabatic",
    "conical intersection",
    "chemical induction",
    "excited state",
    "gradient",
    "ground state"
  ],
  "references": [
    "PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 309 (https://doi.org/10.1351/pac200779030293)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/branching-plane/"
}

Record 1,586 of 13,676 in Chemistry terminology (MLC-0109). Request the full dataset.