Mechanical effect of van der Waals interactions observed in real time in an ultracold Rydberg gas

Details Mechanical effect of van der Waals interactions observed in real time in an ultracold Rydberg gas Mechanical effect of van der Waals interactions observed in real time in an ultracold Rydberg gas

2006-07-05

arxiv.org/abs/physics/0607041v1

Physics

Atomic Physics

Scientific paper

We present time-resolved spectroscopic measurements of Rydberg-Rydberg interactions in an ultracold gas, revealing the pair dynamics induced by long-range van der Waals interactions between the atoms. By detuning the excitation laser, a specific pair distribution is prepared. Penning ionization on a microsecond timescale serves as a probe for the pair dynamics under the influence of the attractive long-range forces. Comparison with a Monte Carlo model not only explains all spectroscopic features but also gives quantitative information about the interaction potentials. The results imply that the interaction-induced ionization rate can be influenced by the excitation laser. Surprisingly, interaction-induced ionization is also observed for Rydberg states with purely repulsive interactions.

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