@article{2010-weber-widera-phys-rev-a-v82-p042722, Abstract = {We study cold interspecies collisions of cesium and rubidium in a strongly imbalanced system with single and few Cs atoms. Observation of the single-atom fluorescence dynamics yields insight into light-induced loss mechanisms, while both subsystems can remain in steady state. This significantly simplifies the analysis of the dynamics, as Cs-Cs collisions are effectively absent and the majority component remains unaffected, allowing us to extract a precise value of the Rb-Cs collision parameter. Extending our results to ground-state collisions would allow to use single neutral atoms as coherent probes for larger quantum systems.}, Author = {Weber, C. AND John, S. AND Spethmann, N. AND Meschede, D. AND Widera, A.}, Journal = {Phys. Rev. A}, Pages = {042722}, Title = {{Single Cs Atoms as Collisional Probes in a large Rb Magneto-Optical Trap}}, Volume = {82}, Year = {2010} }