### Abstract

We investigate the time evolution of freely expanded Bose-Einstein condensates by measuring their aspect ratios at different times after their release from a magnetic trap. In these measurements the condensates contain no more than 9000 ^{87}Rb atoms. By varying the trapping frequency and atom number, we measure the condensate aspect ratios at different expansion times in free space. We compare our measurements with those calculated from the Thomas-Fermi model and a direct numerical solution. Under our trapping condition, the data of the time dependent aspect ratios of the freely expanded condensates reasonably agrees with the numerical calculations, but shows a clear deviation from the predictions of the Thomas-Fermi model when the atom number in the condensates is small.

Original language | English |
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Pages (from-to) | 104-114 |

Number of pages | 11 |

Journal | Chinese Journal of Physics |

Volume | 45 |

Issue number | 2 I |

State | Published - 1 Apr 2007 |

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## Cite this

*Chinese Journal of Physics*,

*45*(2 I), 104-114.