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Interatomic Coulombic decay — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Interatomic_Coulombic_decay
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-07T14:28:09.648Z
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Interatomic Coulombic decay — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Interatomic_Coulombic_decay (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_eb7bc72a15bf (Metraipolis archive dc_eb7bc72a15bf, sha256 cbb8107c8d8ae21cbcf95c701b251d3a3ea2d3b4545ce8008f32526a86852b93)

BibTeX

@misc{dceb7bc72a15bf,
  title = {Interatomic Coulombic decay — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Interatomic_Coulombic_decay},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_eb7bc72a15bf; sha256 cbb8107c8d8ae21cbcf95c701b251d3a3ea2d3b4545ce8008f32526a86852b93},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Interatomic_Coulombic_decay. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Interatomic Coulombic decay (ICD) is a general, fundamental property of atoms and molecules that have neighbors. Interatomic (intermolecular) Coulombic decay is a very efficient interatomic (intermolecular) relaxation process of an electronically excited atom or molecule embedded in an environment. Without the environment the process cannot take place. Until now it has been mainly demonstrated for atomic and molecular clusters, independently of whether they are of van-der-Waals or hydrogen bonded type. The nature of the process can be depicted as follows: Consider a cluster with two subunits, A and B. Suppose an inner-valence electron is removed from subunit A. If the resulting (ionized) state is higher in energy than the double ionization threshold of subunit A then an intraatomic (intramolecular) process (autoionization, in the case of core ionization Auger decay) sets in. Even though the excitation is energetically not higher than the double ionization threshold of subunit A itself, it may be higher than the double ionization threshold of the cluster which is lowered due to charge separation. If this is the case, an interatomic (intermolecular) process sets in which is called ICD. During the ICD the excess energy of subunit A is used to remove (due to electronic correlation) an outer-valence electron from subunit B. As a result, a doubly ionized cluster is formed with a single positive charge on A and B. Thus, charge separation in the final state is a fingerprint of ICD. As a consequence of the charge separation the cluster typically breaks apart via Coulomb explosion. ICD is characterized by its decay rate or the lifetime of the excited state. The decay rate depends on the interatomic (intermolecular) distance of A and B and its dependence allows to draw conclusions on the mechanism of ICD. Particularly important is the determination of the kinetic energy spectrum of the electron emitted from subunit B which is denoted as ICD electron. ICD electrons are often measured in ICD experiments. Typically, ICD takes place on the femto second time scale, many orders of magnitude faster than those of the competing photon emission and other relaxation processes.

Tema degli esploratori: fisica e astronomia (deposito sistematico; categoria «Quantum mechanics»).
Fonte: Wikipedia in inglese, voce «Interatomic Coulombic decay» — https://en.wikipedia.org/wiki/Interatomic_Coulombic_decay
Wikidata Q6045511 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q6045511
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Interatomic_Coulombic_decay?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1368843708, consultata il 2026-10-07T14:07:56.519Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: b2af37b459e99e9b4f73c08aa368d98b659bb5e4bd4d953fc03fb7a310d02270