Unactivated adsorption process

{
  "id": "MLC-T-CHM-012413",
  "term": "Unactivated adsorption process",
  "field": "Chemistry",
  "definition": "An adsorption process with negligible activation energy, so its rate hardly changes with temperature. Because nearly every molecule arriving at a bare surface is captured, the sticking coefficient at low coverage approaches unity, especially for small molecules. Chemisorption that needs activation instead speeds up as the temperature rises, following an Arrhenius law, which is the contrast with an activated process.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "activation energy",
    "adsorption",
    "coefficient",
    "sticking coefficient"
  ],
  "references": [
    "PAC, 1976, 46, 71. 'Manual of Symbols and Terminology for Physicochemical Quantities and Units - Appendix II. Definitions, Terminology and Symbols in Colloid and Surface Chemistry. Part II: Heterogeneous Catalysis' on page 79 (https://doi.org/10.1351/pac197646010071)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/unactivated-adsorption-process/"
}