  Highly sensitive, non-destructive, real-time spectroscopic determination of
the 2D kinetic momentum distribution of a cold-atom sample is performed with
the three-beam measurement of the recoil-induced resonances. The measurements
performed with an operating magneto-optical trap reveal slow velocity drifts
within a stationary atomic cloud and strong anisotropy and asymmetry of the
non-Maxwellian momentum distribution. The developed method can be easily
extended to 3D.
