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We have studied hetero- and homonuclear excited state/ground state collisionsby loading both $^{85}$Rb and $^{87}$Rb into a far off resonant trap (FORT).Because of the relatively weak confinement of the FORT, we expect the hyperfinestructure of the different isotopes to play a crucial role in the collisionrates. This dependence on hyperfine structure allows us to measure collisionsassociated with long range interatomic potentials of different structure: suchas long and short ranged; or such as purely attractive, purely repulsive, ormixed attractive and repulsive. We observe significantly different loss ratesfor different excited state potentials. Additionally, we observe that somecollisional channels' loss rates are saturated at our operating intensities(~15 mW/cm$^{2}$). These losses are important limitations in loading dualisotope optical traps.

Light Assisted Collisional Loss in a $^{85/87}$Rb Ultracold Optical Trap