Individual Tracer Atoms in an Ultracold Dilute Gas.

@article{Hohmann2017IndividualTA,
  title={Individual Tracer Atoms in an Ultracold Dilute Gas.},
  author={Michael Dipl Ing Hohmann and Farina Kindermann and Tobias Lausch and Daniel B. Mayer and Felix Schmidt and Eric Lutz and Artur Widera},
  journal={Physical review letters},
  year={2017},
  volume={118 26},
  pages={
          263401
        }
}
We report on the experimental investigation of individual Cs atoms impinging on a dilute cloud of ultracold Rb atoms with variable density. We study the relaxation of the initial nonthermal state and detect the effect of single collisions which has so far eluded observation. We show that, after few collisions, the measured spatial distribution of the tracer atoms is correctly described by a Langevin equation with a velocity-dependent friction coefficient, over a large range of Knudsen numbers… 

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