Stark effect

{
  "id": "MLC-T-MET-009206",
  "term": "Stark effect",
  "field": "Meteorology and atmospheric science",
  "definition": "The shift and splitting of atomic and molecular energy levels, and so of their spectral lines, caused by an external electric field. The splitting is proportional to the field strength for the linear effect seen in hydrogen, but to its square for most other atoms and polar molecules, which show the quadratic effect. Laboratory microwave spectroscopy exploits it through Stark modulation of the absorption lines of polar molecules.",
  "url": "https://mlchart.com/terminology/meteorology/stark-effect/"
}