Radio-frequency association of molecules: an assisted Feshbach resonance |
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Authors: | Q. Beaufils A. Crubellier T. Zanon B. Laburthe-Tolra é. Maréchal L. Vernac O. Gorceix |
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Affiliation: | 1.Laboratoire de Physique des Lasers, CNRS UMR 7538,Université Paris 13,Villetaneuse,France;2.Laboratoire Aimé Cotton, CNRS II,Orsay Cedex,France |
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Abstract: | We develop a theoretical model to describe the radio-frequency (rf) induced coupling of a pair of colliding atoms to a Feshbach molecule when a magnetic field arbitrarily far from the Feshbach resonance is modulated in time. We use the dressed atom picture, and show that the coupling strength in presence of rf is equal to the Feshbach coupling strength multiplied by the square of a Bessel function. The argument of this function is equal to the ratio of the atomic rf Rabi frequency to the rf frequency. We experimentally demonstrate this law by measuring the rate of rf-association of molecules using a Feshbach resonance in d wave collisions between ultra-cold chromium atoms. |
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