The supersonic free-jet expansion technique has been used in different fields of physics, chemical physics and chemistry to study vibrational and rotational molecular structures in both ground and excited electronic energy states as well as in studies of neutral-neutral interactions. The technique exploits a source of monokinetic, rotationally and vibrationally cold molecules that are very weakly bound in their ground electronic states. Recently, the method is applied as a source of pairs of entangled atoms to test Bell's inequalities.
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