%0 Journal Article %J Physical review letters %D 2006 %T Signatures of strong momentum localization via entanglement of translational and internal states. %A Nir Bar-Gill %A Gershon Kurizki %X We show that atoms or molecules subject to fields that couple their internal and translational (momentum) states may undergo a crossover from randomization (diffusion) to strong localization (sharpening) of their momentum distribution. The predicted crossover should be manifest by a drastic change of the interference pattern as a function of the coupling fields. %B Physical review letters %V 97 %G eng