  We propose to track position and velocity of mobile Rydberg excited impurity
atoms through the elastic interactions of the Rydberg electron with a host
condensate. Tracks first occur in the condensate phase, but are then naturally
converted to features in the condensate density or momentum distribution. The
condensate thus acts analogous to the cloud or bubble chambers in the early
days of elementary particle physics. The technique will be useful for exploring
Rydberg-Rydberg scattering, rare inelastic processes involving the Rydberg
impurities, coherence in Rydberg motion and forces exerted by the condensate on
the impurities. Our simulations show that resolvable tracks can be generated
within the immersed Rydberg lifetime and condensate heating is under control.
Finally, we demonstrate the utility of this Rydberg tracking technique to study
ionizing Rydberg collisions or angular momentum changing interactions with the
condensate.
