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Spatial observation of Bose-Einstein condensation of 87 Rb in a confining potential

Summary: Spatial observation of Bose-Einstein condensation of 87
Rb in a confining potential
B. P. Anderson and M. A. Kasevich
Physics Department, Yale University, New Haven, Connecticut 06520
Received 1 July 1998
Bose-Einstein condensation of 87
Rb has been observed in a vapor cell time-averaged orbiting potential trap,
and the trapped condensates have been studied using in situ absorption and dark-ground imaging methods.
Condensates of 3 104
atoms were observed after 26 s of evaporative cooling. The evaporative cooling
sequence consisted of a combination of cooling with ramping magnetic-field strengths and radio-frequency-
induced cooling. The measured sizes, numbers of atoms, and transition temperatures of the condensates are
consistent with theoretical predictions that include the effects of atomic interactions. S1050-2947 99 50502-7
PACS number s : 03.75.Fi, 05.30.Jp, 32.80.Pj
The ground-breaking studies of Bose-Einstein condensed,
dilute atomic vapors have enabled new tests of theory for
weakly interacting degenerate Bose gases 13 . Important
examples of such tests include measurements of condensate
fraction and the mean-field interaction energy 4,5 . In pre-
vious experiments, these studies have been based on momen-


Source: Anderson, Brian P. - Optical Sciences Center, University of Arizona


Collections: Physics