Sodium Bose-Einstein Condensates in theF=2State in a Large-Volume Optical Trap

A. Görlitz, T. L. Gustavson, A. E. Leanhardt, R. Löw, A. P. Chikkatur, S. Gupta, S. Inouye, D. E. Pritchard, W. Ketterle
2003 Physical Review Letters  
We have investigated the properties of Bose-Einstein condensates of sodium atoms in the upper hyperfine ground state in a purely optical trap. Condensates in the high-field seeking | F=2, m_F=-2> state were created from initially prepared | F=1,m_F=-1> condensates using a one-photon microwave transition at 1.77 GHz. The condensates were stored in a large-volume optical trap created by a single laser beam with an elliptical focus. We found condensates in the stretched state | F=2, m_F=-2> to be
more » ... table for several seconds at densities in the range of 10^14 atoms/cm^3. In addition, we studied the clock transition | F=1, m_F=0> → | F=2, m_F=0> in a sodium Bose-Einstein condensate and determined a density-dependent frequency shift of (2.44± 0.25) × 10^-12 Hz cm^3.
doi:10.1103/physrevlett.90.090401 pmid:12689206 fatcat:3eerk63o75fbdiyx7geuta26qm