July 1995 Colorado 57Rb
fall 1995 Rice U 7Li
July 1996 MIT 23Na
in the last two years also seen in (a) U. Of Texas; (b) Stanford; (c) Rowland Institute (d) NIST; (e) University of Konstanz (f) Max-Planck Ins. in Munich
The MIT people described how they overcame the leak in their trap using optical plug
Here are two links that discuss photoassociation experiments and what you can get from such cold experiments. This link explains the interaction between a Li atom in the ground state and another Li atom in the excited state. Photoassociation spectra can be seen here.