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We report the first observation of Bragg scattering from atomic ions confined in an electromagnetic trap. The results reveal long-range order and give evidence for bulk behavior in a strongly coupled collection of laser-cooled ^9Be^+ ions in a Penning trap. Long-range order emerges in approximately spherical clouds with as few as 5 10^4 ions (cloud radius r₀37a where a-Seitz0ex{0ex}radius). Bulk behavior is evident with 2. 7 10^5 trapped ions (r₀65a), with Bragg scattering patterns characteristic of a body-centered cubic lattice.
Tan et al. (Mon,) studied this question.
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