Abstract
We have observed the deflection of Rydberg atoms towards a metallic surface by the van der Waals force. Cs and Na atoms in states of principal quantum number n were sent between two parallel gold-coated mirrors, spaced by a gap w (2.1 μm≤w≤8.5 μm). We measured the value nm at which the transmission cuts off and from the variation of nm versus w, we obtained a measure of the atom-surface interaction. For 12<n<30 this interaction is 3–4 orders of magnitude larger than for ground-state atoms, and it obeys the scaling laws of the Lennard-Jones model.
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