Abstract
In this paper we re-obtain the retarded as well as the non-retarded force between an electrically polarizable atom and a magnetically polarizable one in a very simple and suggestive way. Using a perturbative approach, we show that while the retarded force between these two atoms is proportional to 1/r8, the non-retarded force is proportional to 1/r5, in agreement with Feinberg and Sucher's result (Feinberg G and Sucher J 1970 Phys. Rev. A 2 2395). This rather surprising result should be contrasted with the 1/r7 behaviour of the London–van der Waals force between two electrically polarizable atoms. Our approach permits us to give a physical interpretation for such a result.
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