An experimental and theoretical guide to strongly interacting Rydberg   gases
  We review experimental and theoretical tools to excite, study and understand strongly interacting Rydberg gases. The focus lies on the excitation of dense ultracold atomic samples close to, or within quantum degeneracy, to high lying Rydberg states. The major part is dedicated to highly excited S-states of Rubidium, which feature an isotropic van-der-Waals potential. Nevertheless, the setup and the methods presented are also applicable to other atomic species used in the field of laser cooling and atom trapping. 
Robert L\"ow, Hendrik Weimer, Johannes Nipper, Jonathan B. Balewski,   Bj\"orn Butscher, Hans Peter B\"uchler, Tilman Pfau
physics.atom-ph quant-ph