Abstract
Abstract In this chapter, we present a review of Rydberg atom interactions. The review focusses on the importance of these interactions in ultracold Rydberg atom physics. We address how these interactions are calculated and how measurements are carried out to probe them. We also describe the different types of exotic molecules that can be formed in ultracold Rydberg gases as a result of interactions between Rydberg atoms and ground state atoms. We connect the studies of ultracold Rydberg molecules to prior work done on photoassociation of atoms in ultracold gases. After discussing pair interactions between Rydberg atoms, we describe work done on multiparticle and many-body interactions and its connection to pair interactions. Finally, we present our perspective on future directions.
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