Col

{
  "id": "MLC-T-CHM-002197",
  "term": "Col",
  "field": "Chemistry",
  "definition": "A saddle point on a potential-energy surface, representing a transition state between reactants and products in a chemical reaction. At a col, the energy is a maximum along the reaction coordinate but a minimum in all other perpendicular directions. The properties of the col determine the activation energy and rate of the reaction.",
  "synonyms": [
    "saddle point"
  ],
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "gradient",
    "potential-energy surface",
    "reaction coordinate"
  ],
  "references": [
    "PAC, 1996, 68, 149. 'A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)' on page 158 (https://doi.org/10.1351/pac199668010149)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/col/"
}