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We have produced a sample of free sodium atoms at rest in the laboratory by decelerating atoms in an atomic beam using momentum transfer from a counterpropagating, resonant laser beam. These atoms have a density of about 10^5 cm^-3 and a velocity spread of about 15 m/s full width at half maximum corresponding to a kinetic temperature less than 100 mK.
Prodan et al. (Mon,) studied this question.
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