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European Quantum Electronics Conference (EQEC)

Feshbach spectroscopy of a shape resonance

Niels Syassen, Thomas Volz, S. Diirr, Gerhard Rempe, Eric van Kempen, S. J. J. M. F. Kokkelmans

Published Jan 18, 2006• 2 citations
Publisher

Abstract

We present a new spectroscopic technique for investigating shape resonances based on the association and dissociation of ultracold molecules using a Feshbach resonance.
DOI
10.1109/eqec.2005.1567409

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We present a spectroscopy technique for studying cold-collision properties. The technique is based on the association and dissociation of ultracold molecules using a magnetically tunable Feshbach resonance. The energy and lifetime of a shape resonance are determined from a measurement of the dissociation rate. Additional spectroscopic information is obtained from the observation of a spatial interference pattern between an outgoing sss wave and ddd wave. The experimental data agree well with the results from a model, in which the dissociation process is connected to a scattering gedanken experiment, which is analyzed using a coupled-channel calculation.
Ultracold molecules can be associated from ultracold atoms by ramping the magnetic field through a Feshbach resonance. A reverse ramp dissociates the molecules. Under suitable conditions, more than one outgoing partial wave can be populated. A theoretical model for this process is discussed here in detail. The model reveals the connection between the dissociation and the theory of multichannel scattering resonances. In particular, the decay rate, the branching ratio, and the relative phase between the partial waves can be predicted from theory or extracted from experiment. The results are applicable to our recent experiment in 87Rb^{87}\mathrm{Rb}87Rb, which has a ddd-wave shape resonance.