Article,

Direct measurement of the van der Waals interaction between an atom and its images in a micron-sized cavity

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Physical Review Letters, (June 1992)
DOI: 10.1103/physrevlett.68.3432

Abstract

We have measured by laser spectroscopy the energy of interaction between a sodium atom and its images in the walls of a micron-sized cavity. This cavity-QED study is the first direct quantitative test of the Lennard-Jones van der Waals interaction as a function of controlled atom-surface separation and mean-square electric dipole moment.

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