FEYNMAN DIAGRAMS FOR DISPERSION INTERACTIONS OUT OF EQUILIBRIUM — TWO-BODY POTENTIALS FOR ATOMS WITH INITIAL EXCITATION
FEYNMAN DIAGRAMS FOR DISPERSION INTERACTIONS OUT OF EQUILIBRIUM — TWO-BODY POTENTIALS FOR ATOMS WITH INITIAL EXCITATION
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非平衡色散相互作用的费曼图 - 具有初始激发的原子的二体势
DOI:
10.1142/s2010194512007465
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发表时间:
2011
期刊:
影响因子:
--
通讯作者:
C. Henkel
中科院分区:
文献类型:
--
作者:
H. R. Haakh;J. Schiefele;C. Henkel
Diagrammatic techniques are well-known in the calculation of dispersion interactions between atoms or molecules. The multipolar coupling scheme combined with Feynman ordered diagrams significantly reduces the number of graphs compared to elementary stationary perturbation theory. We review calculations of van der Waals-Casimir-Polder forces, focusing on two atoms or molecules, one of which is excited. In this case, calculations of the corresponding force are notorious for mathematical issues connected with the spontaneous decay of the excitation. Treating such unstable states in a full non-equilibrium theory provides a physical interpretation of apparent contradictions in previous results and underlines the importance of decay processes for the intermolecular potential. This may have important implications on reactions in biological systems, where excited states may be relatively long-lived and the resonant intermolecular force may result in directed Brownian motion.
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