First observation of feshbach resonances at very low magnetic field in a 133Cs fountain

Details First observation of feshbach resonances at very low magnetic field in a 133Cs fountain First observation of feshbach resonances at very low magnetic field in a 133Cs fountain

2004-07-13

arxiv.org/abs/physics/0407064v3

Physics

Atomic Physics

7 pages

Scientific paper

One of the main limitations of cesium atomic fountains has been the cold collision frequency shift. By using a method based on a transfer of population by adiabatic passage allowing to prepare cold atomic samples with a well defined ratio of atomic density as well as atom number the collisional shift is controlled at the 10E-3 of its value. A calibration of Zeeman sub-states contribution to the clock shift as a function of the field has been performed. Feshbach resonances have been observed for the first time at very low magnetic field and with a very good resolution. A Monte Carlo simulation has been performed and could fit properly some of experimental data. This constrains some parameters of the theory of collisions.

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