Bose-Einstein condensation of alkaline earth atoms: ;{40}Ca.
We have achieved Bose-Einstein condensation of ;{40}Ca, the first for an alkaline earth element. The influence of elastic and inelastic collisions associated with the large ground-state s-wave scattering length of ;{40}Ca was measured. From these findings, an optimized loading and cooling scheme was developed that allowed us to condense about 2 x 10;{4} atoms after laser cooling in a two-stage magneto-optical trap and subsequent forced evaporation in a crossed dipole trap within less than 3 s. The condensation of an alkaline earth element opens novel opportunities for precision measurements on the narrow intercombination lines as well as investigations of molecular states at the ;{1}S-;{3}P asymptotes.
Kraft
Sebastian
S
Physikalisch-Technische Bundesanstalt (PTB), 38116 Braunschweig, Germany. sebastian.kraft@ptb.de
Vogt
Felix
F
Appel
Oliver
O
Riehle
Fritz
F
Sterr
Uwe
U