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We have studied the effects of loading $^{87}$Rb into a far off resonant trap(FORT) in the presence of an ultracold cloud of $^{85}$Rb. The presence of the$^{85}$Rb resulted in a marked decrease of the $^{87}$Rb load rate. Thisdecrease is consistent with a decrease in the laser cooling efficiency neededfor effective loading. While many dynamics which disrupt loading efficencyarise when cooling in a dense cloud of atoms (reabsorption, adverse opticalpumping, etc.), the large detuning between the transitions of $^{85}$Rb and$^{87}$Rb should isolate the isotopes from these effects. For our opticalmolasses conditions we calculate that our cooling efficiencies require inducedground-state coherences. We present data and estimates which are consistentwith heteronuclear long-ranged induced dipole-dipole collisions disruptingthese ground state coherences, leading to a loss of optical trap loadingefficiency.

Decoherence via induced dipole collisions in an ultracold gas