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Atomic-beam sodium atoms were slowed to zero or negative velocities by counterpropagating laser radiation which was frequency chirped with precise electro-optic modulation techniques. The resulting "gas cloud" had a temperature below 50 mK and a density above 10^6 atoms/cm^3. We mention future possibilities in atom slowing, deflection, and storage.
Ertmer et al. (Mon,) studied this question.
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