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Temperature dependence of atom-atom interactions
YKI – Ytkemiska institutet.
1999 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 60, 2581-2584 p.Article in journal (Refereed)
Abstract [en]

The interaction potential at finite temperature between two atoms in the asymptotic limit of large separations $R\gg\hbar c/k_{B}T$ is shown to be $V\left(R\right) = -3k_{B}T\alpha^{2}\left(0\right)/R^{6}$, identical to the expression for two classical polarizable dipoles. This is in contrast to the zero-temperature, large-separation Casimir-Polder retarded potential $V\left(R\right) = -23\hbar c\alpha^{2}\left(0\right)/4\pi R^{7}$. The result is demonstrated by taking the low-density limit in the Lifshitz theory of interacting macroscopic bodies, and independently through a quantum-electrodynamical fourth-order perturbation theory calculation with averaging over a thermally excited blackbody radiation field. An interpretation is offered in terms of the nature of the thermal excitations of the field, leading to a manifestation of the correspondence principle at sufficiently large interatomic distances.

Place, publisher, year, edition, pages
1999. Vol. 60, 2581-2584 p.
Keyword [en]
Dispersion forces, atom-atom interactions, Casimir-Polder potentials, van der Waals interactions, Lifshitz theory
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27373OAI: oai:DiVA.org:ri-27373DiVA: diva2:1054377
Note
A1226Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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