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Phys. Rev. Lett. 81, 3811 - 3814 (1998)

Bose-Einstein Condensation of Atomic Hydrogen

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Dale G. Fried, Thomas C. Killian, Lorenz Willmann, David Landhuis, Stephen C. Moss, Daniel Kleppner, and Thomas J. Greytak
Department of Physics and Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

Featured in Phys. Rev. Focus Received 11 September 1998

We report observation of Bose-Einstein condensation (BEC) of a trapped, dilute gas of atomic hydrogen. The condensate and normal gas are studied by two-photon spectroscopy of the 1S- 2S transition. Interactions among the atoms produce a shift of the resonance frequency proportional to density. The condensate is clearly distinguished by its large frequency shift. The peak condensate density is 4.8±1.1×1015 cm-3, corresponding to a condensate population of 109 atoms. The BEC transition occurs at about T  =  50 μK and n  =  1.8×1014 cm-3.


©1998 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.81.3811
DOI: 10.1103/PhysRevLett.81.3811
PACS: 03.75.Fi, 05.30.Jp, 32.80.Pj, 67.65.+z

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