Abstract
Atomic hydrogen is the newest member of the small family of atomic gases that display Bose-Einstein condensation (BEC). The conditions are quite different from those of the alkali metal atom condensates, for the gas condenses at a temperature of 40 microkelvin, rather than in the nanokelvin regime. The atoms are initially trapped using cryogenic methods and is then cooled to BEC by evaporation. More than 109 atoms were trapped in the initial experiments, larger than previous condensates by a factor of thirty. The condensate is studied primarily by two-photon laser spectroscopy on the 1S-2S transition. Both Doppler-free and Doppler-sensitive transitions are visible. The spectral response of the condensate displays some unexpected properties.
© 1999 Optical Society of America
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