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Evans hole

Term · Chemistry · MLC-T-CHM-004131

A dip or minimum observed in the absorption spectrum of a molecule, resulting from the destructive interference between a broad absorption band and a sharp, intense absorption band. This phenomenon is a type of Fano resonance, where a discrete state interacts with a continuum of states. It is often seen in the vibrational spectra of molecules.

Table 1. Record
IdentifierMLC-T-CHM-004131
FieldChemistry
SubjectAnalytical Chemistry
ReferencesPAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 745 (https://doi.org/10.1515/pac-2019-0203)
See alsoFermi resonance
Record as JSON 
{
  "id": "MLC-T-CHM-004131",
  "term": "Evans hole",
  "field": "Chemistry",
  "definition": "A dip or minimum observed in the absorption spectrum of a molecule, resulting from the destructive interference between a broad absorption band and a sharp, intense absorption band. This phenomenon is a type of Fano resonance, where a discrete state interacts with a continuum of states. It is often seen in the vibrational spectra of molecules.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "Fermi resonance"
  ],
  "references": [
    "PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 745 (https://doi.org/10.1515/pac-2019-0203)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/evans-hole/"
}

Record 4,379 of 13,678 in Chemistry terminology (MLC-0109). Request the full dataset.