title: Bose-Einstein condensation of alkaline earth atoms: ;{40}Ca.
abstract: 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.
authors.affiliation: Physikalisch-Technische Bundesanstalt (PTB), 38116 Braunschweig, Germany. sebastian.kraft@ptb.de
authors.forename: Sebastian
authors.initials: S
authors.lastname: Kraft
authors.forename: Felix
authors.initials: F
authors.lastname: Vogt
authors.forename: Oliver
authors.initials: O
authors.lastname: Appel
authors.forename: Fritz
authors.initials: F
authors.lastname: Riehle
authors.forename: Uwe
authors.initials: U
authors.lastname: Sterr