Spatial resolution of spin waves in an ultra-cold gas
  We present the first spatially resolved images of spin waves in a gas. The complete longitudinal and transverse spin field as a function of time and space is reconstructed. Frequencies and damping rates for a standing-wave mode are extracted and compared with theory. 
J. M. McGuirk, H. J. Lewandowski, D. M. Harber, T. Nikuni, J. E.   Williams and E. A. Cornell