ATOMIC LATTICE STRUCTURES IN 2-DIMENSIONAL MOMENTUM-SPACE

In sub-Doppler laser cooling, the application of an additional homogen eous magnetic field gives rise to velocity selective resonances and la ser cooling to nonzero velocities. We present a systematic investigati on of the resulting structures in two-dimensional momentum space in an atomic beam experiment. The rms width of the resonances is close to o ne recoil momentum. The analysis of these structures in terms of a res onance condition shows good quantitative agreement with experimental r esults.