Abstract
We investigate the role of the dc Stark effect in multilevel pairwise interactions between cold Rydberg atoms. We have observed the decay of nD+nD quasi-molecules by detecting the products in the (n+2)P state after pulsed excitation for 29⩽n⩽41. The decay rate can be manipulated with a dc electric field and requires a consideration of the multilevel nature of the process to explain the observations. The time dependence of the (n+2)P signal is found to support a time-dependent picture of the dynamics.
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