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Quantum Electronics and Laser Science Conference

Laser-cooled Rb clocks and juggling atomic fountains

Kurt Gibble

Published Jan 20, 2003• 0 citations
Publisher

Abstract

Summary form only given. We juggle atoms in an atomic fountain by launching 2 balls of laser-cooled Cs atoms in rapid succession. The 2 balls collide near the top of the fountain and we detect the scattered atoms by measuring the changes in the atoms vertical velocity. Measuring the distribution of the velocity component along the collision axis gives the differential cross section. We scan the collision energy E/sub c/ by varying the time delay between launches and get the differential cross sections as a function of energy.

DOI
10.1109/qels.1999.807358

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Summary form only given. We juggle atoms in an atomic fountain by launching 2 balls of laser-cooled Cs atoms in rapid succession. The 2 balls collide near the top of the fountain and we detect the scattered atoms by measuring the changes in the atoms vertical velocity. Measuring the distribution of the velocity component along the collision axis gives the differential cross section. We scan the collision energy E/sub c/ by varying the time delay between launches and get the differential cross sections as a function of energy.
We demonstrate a juggling atomic fountain by launching two laser-cooled balls of 133Cs{}^{133}\mathrm{Cs}133Cs atoms in rapid succession. The atoms collide near the top of the fountain and, by varying the delay between launches, we scan the collision energy from 19 to $150\ensuremath{\mu}\mathrm{K}$. We measure the differential scattering cross section and isolate the contributions from different partial waves including their interferences. We observe the sss-wave energy dependence and the ppp-wave scattering threshold. We infer a triplet sss-wave scattering length of ${\ensuremath{-}400a}_{0}$ and a ppp wave of $({\ensuremath{-}107a}_{0}{)}^{3}$ for ∣F=4,m=4〉+∣3,3〉|F\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4,m\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4〉+|3,3〉∣F=4,m=4〉+∣3,3〉.