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Finite-size-dependent dispersion potentials between atoms and ions dissolved in water

Thiyam, Priyadarshini; Boström, Mathias; Persson, Clas; Parsons, Drew F.; Brevik, Iver Håkon; Sernelius, Bo. E.
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2472647
Date
2014
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  • Institutt for energi og prosessteknikk [2630]
  • Publikasjoner fra CRIStin - NTNU [19849]
Original version
Europhysics letters. 2014, 106 53002-?.   10.1209/0295-5075/106/53002
Abstract
A non-expanded theory is used for dispersion potentials between atoms and ions dissolved in a medium. The first-order dispersion interaction between two atoms in an excited state must account for the fact that the two atoms are coupled via the electromagnetic field and must include effects from background media, retardation and finite size. We show that finite-size corrections when two particles are close change the dispersion interactions in water by several orders of magnitude. We consider as four illustrative examples helium atoms, krypton atoms, phosphate ions, and iodide ions. We demonstrate that, due to large cancellation effects, retardation dominates the interaction for helium atom pairs in an isotropic excited state down to the very small atom-atom separations where finite-size corrections are also important.
Publisher
European Physical Society
Journal
Europhysics letters

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