Perturbation theory

{
  "id": "MLC-T-CHM-008691",
  "term": "Perturbation theory",
  "field": "Chemistry",
  "definition": "A mathematical method used in quantum mechanics to approximate the solutions to a complex quantum system by starting from the known solutions of a simpler, related system. It treats the difference between the complex and simple systems as a small 'perturbation'. This approach is widely applied in computational chemistry to calculate molecular properties and electronic structures.",
  "subject": "Organic and Biomolecular Chemistry",
  "references": [
    "PAC, 1999, 71, 1919. 'Glossary of terms used in theoretical organic chemistry' on page 1957 (https://doi.org/10.1351/pac199971101919)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/perturbation-theory/"
}