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We present the first simultaneous trapping of two different ultracold atomicspecies in a conservative trap. Lithium and cesium atoms are stored in anoptical dipole trap formed by the focus of a CO$_2$ laser. Techniques forloading both species of atoms are discussed and observations of elastic andinelastic collisions between the two species are presented. A model forsympathetic cooling of two species with strongly different mass in the presenceof slow evaporation is developed. From the observed Cs-induced evaporation ofLi atoms we estimate a cross section for cold elastic Li-Cs collisions.Comment: 10 pages 9 figures, submitted to Appl. Phys. B; v2: Corrected  evaporation formulas and some postscript problem

Mixture of ultracold lithium and cesium atoms in an optical dipole trap