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±1.1×10¹⁵cm^-3, corresponding to a condensate population of 10⁹ atoms. The BEC transition occurs at about T0ex0ex=0ex0ex50μK and n0ex0ex=0ex0ex1.8×10¹⁴cm^-3.
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Fried et al. (1998) studied this question.
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